Verdict — Extremely Light But Not Without Some Sacrifices
The Dynabook Portege Z40L-N is distinguished for being one of the lightest 14-inch Windows laptops in the market. While such an achievement usually comes with steep drawbacks, the Dynabook manages to integrate a healthy number of ports, a removable M.2 2280 SSD, full sRGB colors, and a comfortable keyboard and touchpad despite the low weight. We can't overemphasize how much easier it is to use the Dynabook on-the-go when compared to heavier 14-inch laptops like the Samsung Galaxy Book Pro 14 or the HP EliteBook X G1i 14 AI.
Drawbacks are nonetheless present. Aside the overt lack of WAN support, the CPU and SSD in particular are more prone to performance throttling than on many other subnotebooks with similar configuration options. The chassis or skeleton also bends and twists more readily than a stiffer MacBook Air or Dell XPS. More demanding users may therefore still want to consider heavier laptops for the additional horsepower and rigidity.
Pros
+ 3-year warranty standard
+ good selection of ports
+ extremely lightweight
+ long battery life
+ easy to service
Cons
- below average processor performance
- no OLED or high refresh rate options
- RAM not expandable
- SSD may throttle
- no WAN options
Price and Availability
The Dynabook Z40L-N is not widely available through third-party resellers or shops. Systems can be purchased directly from the manufacturer here starting at $1700 for the Core Ultra 5 configuration up to $2200 for our review configuration.
$39.95
BoxWave Keyboard Compatible with Dynabook Portege Z40L (Without Touchscreen) - AquaProof USB Keyboard, Washable Waterproof Water Resistant - Jet Black
- $39.95BoxWave Keyboard Compatible with Dynabook Portege Z40L (with Touchscreen) - AquaProof USB Keyboard, Washable Waterproof Water Resistant - Jet Black
The Portege Z series focuses on ultralight business laptops with the 14-inch Portege Z40L-N being the latest model in the family. Our test unit is the higher-end configuration with the Lunar Lake Core Ultra 7 258V for approximately $2200 while a Core Ultra 5 option with half the RAM is available for $1700. All options come with the same 1200p IPS display and 3-year warranty as standard.
Alternatives to the Portege Z40L-N include other ultralight 14-inch business laptops like the LG Gram series or the Samsung Galaxy Book series.
More Dynabook reviews:
Specifications
Dynabook Portege Z40L-N
Processor
Intel Core Ultra 7 258V 8 x 2.2 - 4.8 GHz, 32 W PL2 / Short Burst, 17 W PL1 / Sustained, Lunar Lake
Graphics adapter
Intel Arc Graphics 140V, Core: 1300 MHz, LPDDR5, 32.0.101.6790
Memory
16 GB
, LPDDR5, Dual-Channel
Display
14.00 inch 16:10, 1920 x 1200 pixel 162 PPI, BOE NE140WUM-N6K, IPS, glossy: no, 60 Hz
Weight
961 g ( = 33.9 oz / 2.12 pounds), Power Supply: 271 g ( = 9.56 oz / 0.6 pounds)
Price
2200 USD
Note: The manufacturer may use components from different suppliers including display panels, drives or memory sticks with similar specifications.
Case
Connectivity
SD Card Reader
| SD Card Reader | |
| average JPG Copy Test (av. of 3 runs) | |
| LG Gram Style 14Z90RS-G.AD7AG (AV PRO microSD 128 GB V60) | |
| Dynabook Portégé X40-K (AV Pro SD microSD V60) | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dynabook Portege Z40L-N (AV PRO microSD 128 GB V60) | |
| maximum AS SSD Seq Read Test (1GB) | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dynabook Portege Z40L-N (AV PRO microSD 128 GB V60) | |
| LG Gram Style 14Z90RS-G.AD7AG (AV PRO microSD 128 GB V60) | |
| Dynabook Portégé X40-K (AV Pro SD microSD V60) | |
Communication
Dynabook Portege Z40L-N; iperf3 transmit AXE11000 6GHz; iperf 3.1.3: Ø1003 (936-1059)
Dynabook Portege Z40L-N; iperf3 receive AXE11000 6GHz; iperf 3.1.3: Ø1204 (1152-1225)
Webcam
12.4 ∆E
8.4 ∆E
15.4 ∆E
16.3 ∆E
14 ∆E
12.2 ∆E
12.8 ∆E
9.7 ∆E
11.6 ∆E
11.5 ∆E
9.9 ∆E
10.6 ∆E
7.9 ∆E
12.9 ∆E
17.1 ∆E
9 ∆E
11.3 ∆E
16.3 ∆E
5.1 ∆E
6.6 ∆E
9.1 ∆E
12.8 ∆E
16.1 ∆E
10.3 ∆E
Maintenance
Input Devices
Display
| |||||||||||||||||||||||||
BOE NE140WUM-N6K tested with X-Rite i1Pro 3
Maximum: 445.4 cd/m² (Nits) Average: 424.5 cd/m² Minimum: 23.7 cd/m²Brightness Distribution: 91 %
Center on Battery: 445.4 cd/m²
Contrast: 1937:1 (Black: 0.23 cd/m²)
ΔE ColorChecker Calman: 2.85 | ∀{0.5-29.43 Ø4.83}
calibrated: 1.54
ΔE Greyscale Calman: 3.3 | ∀{0.09-98 Ø5.1}
71.8% AdobeRGB 1998 (Argyll 3D)
99% sRGB (Argyll 3D)
70.1% Display P3 (Argyll 3D)
Gamma: 2.03
CCT: 6497 K
| Dynabook Portege Z40L-N BOE NE140WUM-N6K, IPS, 1920x1200, 14", 60 Hz | Dynabook Portégé X40-K Chi Mei N140HCA-EAC, IPS, 1920x1080, 14", 60 Hz | LG Gram Style 14Z90RS-G.AD7AG Samsung SDC417F ATNA40YK10-1, OLED, 2880x1800, 14", 90 Hz | Lenovo ThinkBook 14 Gen 8 21SJ007SGE LEN140WUXGA, IPS LED, 1920x1200, 14", 60 Hz | Dell Pro 14 Premium LG Phillips 140WT1, OLED, 2880x1800, 14", 60 Hz | HP EliteBook X G1i 14 AI IPS, 1920x1200, 14", 60 Hz | |
|---|---|---|---|---|---|---|
| Display | -37% | 25% | -40% | 25% | -0% | |
| Display P3 Coverage | 70.1 | 43.4 -38% | 99.92 43% | 41.5 -41% | 99 41% | 69.9 0% |
| sRGB Coverage | 99 | 64.6 -35% | 100 1% | 60.3 -39% | 100 1% | 98.4 -1% |
| AdobeRGB 1998 Coverage | 71.8 | 44.9 -37% | 94.71 32% | 42.9 -40% | 95.8 33% | 71.6 0% |
| Response Times | 22% | 94% | 48% | 85% | -3% | |
| Response Time Grey 50% / Grey 80% * | 42.1 ? | 33.6 ? 20% | 2 ? 95% | 19.3 ? 54% | 1.4 ? 97% | 42.3 ? -0% |
| Response Time Black / White * | 26.7 ? | 20.4 ? 24% | 2 ? 93% | 15.8 ? 41% | 2.7 ? 90% | 28 ? -5% |
| PWM Frequency | 350 | 241.1 ? | ||||
| PWM Amplitude * | 100 | 32 68% | ||||
| Screen | -92% | 32% | -97% | 4% | 3% | |
| Brightness middle | 445.4 | 246.4 -45% | 384 -14% | 271 -39% | 392.3 -12% | 487.5 9% |
| Brightness | 424 | 237 -44% | 388 -8% | 276 -35% | 392 -8% | 469 11% |
| Brightness Distribution | 91 | 88 -3% | 97 7% | 89 -2% | 95 4% | 91 0% |
| Black Level * | 0.23 | 0.41 -78% | 0.054 77% | 0.29 -26% | 0.26 -13% | |
| Contrast | 1937 | 601 -69% | 7111 267% | 934 -52% | 1875 -3% | |
| Colorchecker dE 2000 * | 2.85 | 6 -111% | 2.47 13% | 6.4 -125% | 3.39 -19% | 2.37 17% |
| Colorchecker dE 2000 max. * | 4.57 | 21.16 -363% | 4.33 5% | 20.7 -353% | 6.53 -43% | 5.77 -26% |
| Colorchecker dE 2000 calibrated * | 1.54 | 1.86 -21% | 2.81 -82% | 5.1 -231% | 0.99 36% | 0.86 44% |
| Greyscale dE 2000 * | 3.3 | 6.4 -94% | 2.63 20% | 3.6 -9% | 1.1 67% | 3.8 -15% |
| Gamma | 2.03 108% | 2.01 109% | 2.18 101% | 1.99 111% | 2.23 99% | 2.14 103% |
| CCT | 6497 100% | 6738 96% | 6279 104% | 6576 99% | 6502 100% | 6540 99% |
| Total Average (Program / Settings) | -36% /
-64% | 50% /
39% | -30% /
-64% | 38% /
27% | 0% /
1% |
* ... smaller is better
Display Response Times
ℹ
Display response times show how fast the screen is able to change from one color to the next. Slow response times can lead to afterimages and can cause moving objects to appear blurry (ghosting). Gamers of fast-paced 3D titles should pay special attention to fast response times.| ↔ Response Time Black to White | ||
|---|---|---|
| 26.7 ms ... rise ↗ and fall ↘ combined | ↗ 12 ms rise |  |
| ↘ 14.7 ms fall | ||
| The screen shows relatively slow response rates in our tests and may be too slow for gamers. In comparison, all tested devices range from 0.1 (minimum) to 240 (maximum) ms. » 65 % of all devices are better. This means that the measured response time is worse than the average of all tested devices (20.5 ms). | ||
| ↔ Response Time 50% Grey to 80% Grey | ||
| 42.1 ms ... rise ↗ and fall ↘ combined | ↗ 19.6 ms rise |  |
| ↘ 22.5 ms fall | ||
| The screen shows slow response rates in our tests and will be unsatisfactory for gamers. In comparison, all tested devices range from 0.165 (minimum) to 636 (maximum) ms. » 68 % of all devices are better. This means that the measured response time is worse than the average of all tested devices (32.1 ms). | ||
Screen Flickering / PWM (Pulse-Width Modulation)
ℹ
To dim the screen, some notebooks will simply cycle the backlight on and off in rapid succession - a method called Pulse Width Modulation (PWM) . This cycling frequency should ideally be undetectable to the human eye. If said frequency is too low, users with sensitive eyes may experience strain or headaches or even notice the flickering altogether.| Screen flickering / PWM not detected |  | ||
In comparison: 53 % of all tested devices do not use PWM to dim the display. If PWM was detected, an average of 8327 (minimum: 5 - maximum: 343500) Hz was measured. | |||
Performance
Testing Conditions
We set Windows to Performance mode prior to running the benchmarks below.
Processor
Cinebench R15 Multi Loop
Dynabook Portege Z40L-N Intel Core Ultra 7 258V: Ø1101 (1084.28-1280.25)
Dynabook Portégé X40-K Intel Core i7-1260P: Ø1487 (1467.3-1868.9)
LG Gram Style 14Z90RS-G.AD7AG Intel Core i7-1360P: Ø1209 (1178.03-1454.97)
Lenovo ThinkBook 14 Gen 8 21SJ007SGE Intel Core Ultra 7 255H: Ø2448 (2324.64-2796.42)
Dell Pro 14 Premium Intel Core Ultra 7 268V: Ø1553 (1539.35-1573.81)
HP EliteBook X G1i 14 AI Intel Core Ultra 7 268V: Ø1593 (1490.76-1616.03)
CPU Performance Rating: Percent
Cinebench R23: Multi Core | Single Core
Cinebench R20: CPU (Multi Core) | CPU (Single Core)
Cinebench R15: CPU Multi 64Bit | CPU Single 64Bit
Blender: v2.79 BMW27 CPU
7-Zip 18.03: 7z b 4 | 7z b 4 -mmt1
Geekbench 6.4: Multi-Core | Single-Core
Geekbench 5.5: Multi-Core | Single-Core
HWBOT x265 Benchmark v2.2: 4k Preset
LibreOffice : 20 Documents To PDF
R Benchmark 2.5: Overall mean
Cinebench R23: Multi Core | Single Core
Cinebench R20: CPU (Multi Core) | CPU (Single Core)
Cinebench R15: CPU Multi 64Bit | CPU Single 64Bit
Blender: v2.79 BMW27 CPU
7-Zip 18.03: 7z b 4 | 7z b 4 -mmt1
Geekbench 6.4: Multi-Core | Single-Core
Geekbench 5.5: Multi-Core | Single-Core
HWBOT x265 Benchmark v2.2: 4k Preset
LibreOffice : 20 Documents To PDF
R Benchmark 2.5: Overall mean
CPU Performance Rating: Percent
Cinebench R23: Multi Core | Single Core
Cinebench R20: CPU (Multi Core) | CPU (Single Core)
Cinebench R15: CPU Multi 64Bit | CPU Single 64Bit
Blender: v2.79 BMW27 CPU
7-Zip 18.03: 7z b 4 | 7z b 4 -mmt1
Geekbench 6.4: Multi-Core | Single-Core
Geekbench 5.5: Multi-Core | Single-Core
HWBOT x265 Benchmark v2.2: 4k Preset
LibreOffice : 20 Documents To PDF
R Benchmark 2.5: Overall mean
Cinebench R23: Multi Core | Single Core
Cinebench R20: CPU (Multi Core) | CPU (Single Core)
Cinebench R15: CPU Multi 64Bit | CPU Single 64Bit
Blender: v2.79 BMW27 CPU
7-Zip 18.03: 7z b 4 | 7z b 4 -mmt1
Geekbench 6.4: Multi-Core | Single-Core
Geekbench 5.5: Multi-Core | Single-Core
HWBOT x265 Benchmark v2.2: 4k Preset
LibreOffice : 20 Documents To PDF
R Benchmark 2.5: Overall mean
* ... smaller is better
Performance Rating: Percent
AIDA64: FP32 Ray-Trace | FPU Julia | CPU SHA3 | CPU Queen | FPU SinJulia | FPU Mandel | CPU AES | CPU ZLib | FP64 Ray-Trace | CPU PhotoWorxx
AIDA64: FP32 Ray-Trace | FPU Julia | CPU SHA3 | CPU Queen | FPU SinJulia | FPU Mandel | CPU AES | CPU ZLib | FP64 Ray-Trace | CPU PhotoWorxx
| Performance Rating | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V | |
| Dynabook Portégé X40-K | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portege Z40L-N | |
| AIDA64 / FP32 Ray-Trace | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V (8454 - 12781, n=19) | |
| Dynabook Portégé X40-K | |
| Dynabook Portege Z40L-N | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| AIDA64 / FPU Julia | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V (40875 - 63401, n=19) | |
| Dynabook Portégé X40-K | |
| Dynabook Portege Z40L-N | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| AIDA64 / CPU SHA3 | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V (1930 - 2817, n=19) | |
| Dynabook Portégé X40-K | |
| Dynabook Portege Z40L-N | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| AIDA64 / CPU Queen | |
| Dynabook Portégé X40-K | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V (49084 - 49818, n=19) | |
| HP EliteBook X G1i 14 AI | |
| Dynabook Portege Z40L-N | |
| AIDA64 / FPU SinJulia | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dynabook Portégé X40-K | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dell Pro 14 Premium | |
| HP EliteBook X G1i 14 AI | |
| Average Intel Core Ultra 7 258V (3817 - 4440, n=19) | |
| Dynabook Portege Z40L-N | |
| AIDA64 / FPU Mandel | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V (21670 - 33565, n=19) | |
| Dynabook Portege Z40L-N | |
| Dynabook Portégé X40-K | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| AIDA64 / CPU AES | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dynabook Portégé X40-K | |
| Dell Pro 14 Premium | |
| HP EliteBook X G1i 14 AI | |
| Average Intel Core Ultra 7 258V (30957 - 40753, n=19) | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portege Z40L-N | |
| AIDA64 / CPU ZLib | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dynabook Portégé X40-K | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V (422 - 632, n=19) | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portege Z40L-N | |
| AIDA64 / FP64 Ray-Trace | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V (4258 - 6930, n=19) | |
| Dynabook Portege Z40L-N | |
| Dynabook Portégé X40-K | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| AIDA64 / CPU PhotoWorxx | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V (44223 - 54971, n=19) | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dynabook Portege Z40L-N | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
Stress Test
| Average CPU Clock (GHz) | GPU Clock (MHz) | Average CPU Temperature (°C) | |
| System Idle | -- | -- | 44 |
| Prime95 Stress | 2.2 | 800 | 82 |
| Prime95 + FurMark Stress | 1.6 | 850 | 79 |
| Cyberpunk 2077 Stress | 0.98 | 1300 | 75 |
System Performance
Performance Rating: Percent
PCMark 10: Score | Essentials | Productivity | Digital Content Creation
CrossMark: Overall | Productivity | Creativity | Responsiveness
WebXPRT 3: Overall
WebXPRT 4: Overall
Mozilla Kraken 1.1: Total
PCMark 10: Score | Essentials | Productivity | Digital Content Creation
CrossMark: Overall | Productivity | Creativity | Responsiveness
WebXPRT 3: Overall
WebXPRT 4: Overall
Mozilla Kraken 1.1: Total
| Performance Rating | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dell Pro 14 Premium | |
| HP EliteBook X G1i 14 AI | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V | |
| Dynabook Portege Z40L-N | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
| PCMark 10 / Score | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dell Pro 14 Premium | |
| HP EliteBook X G1i 14 AI | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (6265 - 7314, n=18) | |
| Dynabook Portege Z40L-N | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
| PCMark 10 / Essentials | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (9295 - 11467, n=18) | |
| HP EliteBook X G1i 14 AI | |
| Dynabook Portege Z40L-N | |
| Dynabook Portégé X40-K | |
| PCMark 10 / Productivity | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dynabook Portege Z40L-N | |
| Dell Pro 14 Premium | |
| HP EliteBook X G1i 14 AI | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (7357 - 9619, n=18) | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
| PCMark 10 / Digital Content Creation | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (8914 - 10074, n=18) | |
| Dynabook Portege Z40L-N | |
| Dynabook Portégé X40-K | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| CrossMark / Overall | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (1590 - 1742, n=17) | |
| HP EliteBook X G1i 14 AI | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portege Z40L-N | |
| Dynabook Portégé X40-K | |
| CrossMark / Productivity | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (1558 - 1684, n=17) | |
| HP EliteBook X G1i 14 AI | |
| Dynabook Portege Z40L-N | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
| CrossMark / Creativity | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (1727 - 1977, n=17) | |
| HP EliteBook X G1i 14 AI | |
| Dynabook Portege Z40L-N | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
| CrossMark / Responsiveness | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (1251 - 1411, n=17) | |
| Dynabook Portege Z40L-N | |
| Dynabook Portégé X40-K | |
| HP EliteBook X G1i 14 AI | |
| WebXPRT 3 / Overall | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dell Pro 14 Premium | |
| HP EliteBook X G1i 14 AI | |
| Dynabook Portege Z40L-N | |
| Dynabook Portégé X40-K | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (219 - 314, n=17) | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| WebXPRT 4 / Overall | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dell Pro 14 Premium | |
| HP EliteBook X G1i 14 AI | |
| Dynabook Portege Z40L-N | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (199.5 - 291, n=17) | |
| Dynabook Portégé X40-K | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Mozilla Kraken 1.1 / Total | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
| Average Intel Core Ultra 7 258V, Intel Arc Graphics 140V (468 - 559, n=19) | |
| Dynabook Portege Z40L-N | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
* ... smaller is better
| PCMark 10 Score | 6842 points | |
Help | ||
| AIDA64 / Memory Copy | |
| Average Intel Core Ultra 7 258V (104408 - 114336, n=19) | |
| Dell Pro 14 Premium | |
| HP EliteBook X G1i 14 AI | |
| Dynabook Portege Z40L-N | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
| AIDA64 / Memory Read | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V (82846 - 89417, n=19) | |
| Dynabook Portege Z40L-N | |
| HP EliteBook X G1i 14 AI | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
| AIDA64 / Memory Write | |
| Dell Pro 14 Premium | |
| Average Intel Core Ultra 7 258V (108842 - 117935, n=19) | |
| Dynabook Portege Z40L-N | |
| HP EliteBook X G1i 14 AI | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dynabook Portégé X40-K | |
| AIDA64 / Memory Latency | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dell Pro 14 Premium | |
| Dynabook Portege Z40L-N | |
| HP EliteBook X G1i 14 AI | |
| Average Intel Core Ultra 7 258V (95 - 101.1, n=19) | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
* ... smaller is better
DPC Latency
| DPC Latencies / LatencyMon - interrupt to process latency (max), Web, Youtube, Prime95 | |
| Dell Pro 14 Premium | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Dynabook Portégé X40-K | |
| Dynabook Portege Z40L-N | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| HP EliteBook X G1i 14 AI | |
* ... smaller is better
Storage Devices
CDM 5/6 Read Seq Q32T1:
6930 MB/s
CDM 5/6 Write Seq Q32T1:
5678 MB/s
CDM 5/6 Read 4K Q32T1:
455.8 MB/s
CDM 5/6 Write 4K Q32T1:
387.4 MB/s
CDM 5 Read Seq:
3307 MB/s
CDM 5 Write Seq:
2560 MB/s
CDM 5/6 Read 4K:
57.67 MB/s
CDM 5/6 Write 4K:
136.8 MB/s
| Drive Performance Rating - Percent | |
| LG Gram Style 14Z90RS-G.AD7AG | |
| Lenovo ThinkBook 14 Gen 8 21SJ007SGE | |
| Dynabook Portege Z40L-N | |
| HP EliteBook X G1i 14 AI | |
| Dell Pro 14 Premium | |
| Dynabook Portégé X40-K | |
* ... smaller is better
Disk Throttling: DiskSpd Read Loop, Queue Depth 8
Dynabook Portege Z40L-N ; diskspd 2.0.17 f: Ø5543 (2385.35-7034.04)
Dynabook Portégé X30L-K-139 Samsung PM9A1 MZVL2512HCJQ: Ø2309 (1663.07-6603.56)
GPU Performance
| Power Profile | Graphics Score | Physics Score | Combined Score |
| Performance Mode | 7713 | 15893 | 2480 |
| Balanced Mode | 8155 (+6%) | 15924 (+0%) | 2569 (+4%) |
| Battery Power | 8982 (+16%) | 16230 (+2%) | 2638 (+6%) |
| 3DMark 11 Performance | 10529 points | |
| 3DMark Cloud Gate Standard Score | 24204 points | |
| 3DMark Fire Strike Score | 6802 points | |
| 3DMark Time Spy Score | 3503 points | |
Help | ||
* ... smaller is better
Baldur's Gate 3 | GTA V | Dota 2 Reborn | Final Fantasy XV Benchmark | X-Plane 11.11 | Strange Brigade | Cyberpunk 2077 2.2 Phantom Liberty | F1 24
Cyberpunk 2077 ultra FPS Chart
Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V: Ø20.9 (18.4-22.9)
| low | med. | high | ultra | |
|---|---|---|---|---|
| GTA V (2015) | 123.9 | 115.7 | 50.5 | 21.8 |
| Dota 2 Reborn (2015) | 92.4 | 68.9 | 51.4 | 58.2 |
| Final Fantasy XV Benchmark (2018) | 67.7 | 37.1 | 28.2 | |
| X-Plane 11.11 (2018) | 46.8 | 37 | 32.6 | |
| Strange Brigade (2018) | 179.5 | 56.3 | 49 | 46.3 |
| Baldur's Gate 3 (2023) | 34.3 | 29 | 25.6 | 25 |
| Cyberpunk 2077 2.2 Phantom Liberty (2023) | 35.1 | 28.3 | 24.1 | 21 |
| F1 24 (2024) | 67.4 | 63 | 48.1 | 15.3 |
Emissions
System Noise
Noise Level
| Idle |
| 23.6 / 23.6 / 23.6 dB(A) |
| Load |
| 37 / 39 dB(A) |
 | ||
30 dB silent 40 dB(A) audible 50 dB(A) loud |
||
min:  , med:  , max:  Earthworks M23R, Arta (15 cm distance) environment noise: 23.5 dB(A) | ||
| Dynabook Portege Z40L-N Arc 140V, Core Ultra 7 258V | Dynabook Portégé X40-K Iris Xe G7 96EUs, i7-1260P, Samsung PM991 MZVLQ512HBLU | LG Gram Style 14Z90RS-G.AD7AG Iris Xe G7 96EUs, i7-1360P, SK hynix PC801 HFS001TEJ9X101N | Lenovo ThinkBook 14 Gen 8 21SJ007SGE Arc 140T, Ultra 7 255H, Western Digital PCSN5000S SDEPMSJ-1T00-1101 | Dell Pro 14 Premium Arc 140V, Core Ultra 7 268V, Kioxia BG6 KBG6AZNV1T02 | HP EliteBook X G1i 14 AI Arc 140V, Core Ultra 7 268V | |
|---|---|---|---|---|---|---|
| Noise | 3% | -5% | -7% | -4% | -11% | |
| off / environment * | 23.5 | 22.8 3% | 25 -6% | 25.2 -7% | 23.1 2% | 28.2 -20% |
| Idle Minimum * | 23.6 | 23.4 1% | 25 -6% | 25.2 -7% | 23.1 2% | 28.4 -20% |
| Idle Average * | 23.6 | 23.4 1% | 25 -6% | 25.2 -7% | 23.1 2% | 28.4 -20% |
| Idle Maximum * | 23.6 | 23.4 1% | 25 -6% | 25.2 -7% | 23.1 2% | 28.8 -22% |
| Load Average * | 37 | 31.2 16% | 37 -0% | 32.9 11% | 38.2 -3% | 33.5 9% |
| Cyberpunk 2077 ultra * | 37.8 | 44.1 -17% | 44.2 -17% | 39.1 -3% | ||
| Load Maximum * | 39 | 40.5 -4% | 40.62 -4% | 43.9 -13% | 44.2 -13% | 40.4 -4% |
| Witcher 3 ultra * | 27.1 | 37 |
* ... smaller is better
Temperature
(±) The average temperature for the upper side under maximal load is 33.7 °C / 93 F, compared to the average of 29.5 °C / 85 F for the devices in the class Office.
(±) The maximum temperature on the upper side is 41.2 °C / 106 F, compared to the average of 34.3 °C / 94 F, ranging from 21.2 to 62.5 °C for the class Office.
(+) The bottom heats up to a maximum of 38 °C / 100 F, compared to the average of 36.8 °C / 98 F
(+) In idle usage, the average temperature for the upper side is 30 °C / 86 F, compared to the device average of 29.5 °C / 85 F.
(+) The palmrests and touchpad are cooler than skin temperature with a maximum of 27.6 °C / 81.7 F and are therefore cool to the touch.
(±) The average temperature of the palmrest area of similar devices was 27.6 °C / 81.7 F (0 °C / 0 F).
(±) The maximum temperature on the upper side is 41.2 °C / 106 F, compared to the average of 34.3 °C / 94 F, ranging from 21.2 to 62.5 °C for the class Office.
(+) The bottom heats up to a maximum of 38 °C / 100 F, compared to the average of 36.8 °C / 98 F
(+) In idle usage, the average temperature for the upper side is 30 °C / 86 F, compared to the device average of 29.5 °C / 85 F.
(+) The palmrests and touchpad are cooler than skin temperature with a maximum of 27.6 °C / 81.7 F and are therefore cool to the touch.
(±) The average temperature of the palmrest area of similar devices was 27.6 °C / 81.7 F (0 °C / 0 F).
| Dynabook Portege Z40L-N Intel Core Ultra 7 258V, Intel Arc Graphics 140V | Dynabook Portégé X40-K Intel Core i7-1260P, Intel Iris Xe Graphics G7 96EUs | LG Gram Style 14Z90RS-G.AD7AG Intel Core i7-1360P, Intel Iris Xe Graphics G7 96EUs | Lenovo ThinkBook 14 Gen 8 21SJ007SGE Intel Core Ultra 7 255H, Intel Arc Graphics 140T | Dell Pro 14 Premium Intel Core Ultra 7 268V, Intel Arc Graphics 140V | HP EliteBook X G1i 14 AI Intel Core Ultra 7 268V, Intel Arc Graphics 140V | |
|---|---|---|---|---|---|---|
| Heat | 27% | 16% | -1% | 24% | 25% | |
| Maximum Upper Side * | 41.2 | 31.6 23% | 36.3 12% | 44.1 -7% | 33 20% | 35 15% |
| Maximum Bottom * | 38 | 32.8 14% | 36.8 3% | 44.6 -17% | 28 26% | 33.4 12% |
| Idle Upper Side * | 35.4 | 24 32% | 29.2 18% | 31.6 11% | 28 21% | 23.8 33% |
| Idle Bottom * | 39.8 | 24.8 38% | 27.4 31% | 35.4 11% | 28.8 28% | 24.2 39% |
* ... smaller is better
Speakers
Frequency diagram (checkboxes can be checked and unchecked to compare devices)
Dynabook Portege Z40L-N audio analysis
(+) | speakers can play relatively loud (82.1 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 19.3% lower than median
(±) | linearity of bass is average (12.3% delta to prev. frequency)
Mids 400 - 2000 Hz
(±) | higher mids - on average 6.9% higher than median
(+) | mids are linear (6.1% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 3% away from median
(+) | highs are linear (6.8% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (18.3% difference to median)
Compared to same class
» 30% of all tested devices in this class were better, 6% similar, 63% worse
» The best had a delta of 7%, average was 21%, worst was 53%
Compared to all devices tested
» 38% of all tested devices were better, 8% similar, 54% worse
» The best had a delta of 4%, average was 24%, worst was 134%
Apple MacBook Pro 16 2021 M1 Pro audio analysis
(+) | speakers can play relatively loud (84.7 dB)
Bass 100 - 315 Hz
(+) | good bass - only 3.8% away from median
(+) | bass is linear (5.2% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 1.3% away from median
(+) | mids are linear (2.1% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 1.9% away from median
(+) | highs are linear (2.7% delta to prev. frequency)
Overall 100 - 16.000 Hz
(+) | overall sound is linear (4.6% difference to median)
Compared to same class
» 0% of all tested devices in this class were better, 0% similar, 100% worse
» The best had a delta of 5%, average was 18%, worst was 45%
Compared to all devices tested
» 0% of all tested devices were better, 0% similar, 100% worse
» The best had a delta of 4%, average was 24%, worst was 134%
Energy Management
Power Consumption
Power Consumption
| Off / Standby | 0.25 / 0.51 Watt |
| Idle | 1.5 / 4.3 / 4.4 Watt |
| Load |
28.9 / 51 Watt |
   
| |
Key:
min: ,
med: ,
max: Metrahit Energy | |
| Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V, , IPS, 1920x1200, 14" | Dynabook Portégé X40-K i7-1260P, Iris Xe G7 96EUs, Samsung PM991 MZVLQ512HBLU, IPS, 1920x1080, 14" | LG Gram Style 14Z90RS-G.AD7AG i7-1360P, Iris Xe G7 96EUs, SK hynix PC801 HFS001TEJ9X101N, OLED, 2880x1800, 14" | Lenovo ThinkBook 14 Gen 8 21SJ007SGE Ultra 7 255H, Arc 140T, Western Digital PCSN5000S SDEPMSJ-1T00-1101, IPS LED, 1920x1200, 14" | Dell Pro 14 Premium Core Ultra 7 268V, Arc 140V, Kioxia BG6 KBG6AZNV1T02, OLED, 2880x1800, 14" | HP EliteBook X G1i 14 AI Core Ultra 7 268V, Arc 140V, , IPS, 1920x1200, 14" | Average Intel Arc Graphics 140V | Average of class Office | |
|---|---|---|---|---|---|---|---|---|
| Power Consumption | -103% | -89% | -102% | -49% | -42% | -64% | -90% | |
| Idle Minimum * | 1.5 | 5.5 -267% | 3.58 -139% | 4.1 -173% | 3.5 -133% | 2.5 -67% | 3.65 ? -143% | 4.56 ? -204% |
| Idle Average * | 4.3 | 6 -40% | 7.125 -66% | 7.8 -81% | 4.3 -0% | 5.4 -26% | 6.18 ? -44% | 7.54 ? -75% |
| Idle Maximum * | 4.4 | 8.5 -93% | 12.1 -175% | 10.7 -143% | 7.9 -80% | 5.8 -32% | 7.71 ? -75% | 8.98 ? -104% |
| Load Average * | 28.9 | 51.8 -79% | 40.67 -41% | 53.1 -84% | 38.9 -35% | 36.9 -28% | 39.7 ? -37% | 42.2 ? -46% |
| Cyberpunk 2077 ultra external monitor * | 27 | 56.7 -110% | 38.7 -43% | 44.9 -66% | ||||
| Cyberpunk 2077 ultra * | 29.1 | 56.9 -96% | 39 -34% | 48.5 -67% | ||||
| Load Maximum * | 51 | 68.7 -35% | 64.2 -26% | 65.7 -29% | 60.7 -19% | 54.6 -7% | 61 ? -20% | 61.7 ? -21% |
| Witcher 3 ultra * | 41 |
* ... smaller is better
Power Consumption Cyberpunk / Stress Test
Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V; 1280x720 Prime95 28.10 and Furmark 1.25: Ø31.2 (27.3-51)
Dell 14 Plus 2-in-1 Ryzen AI 7 350, Radeon 860M; 1280x720 Prime95 28.10 and Furmark 1.25: Ø41.4 (37.7-59.3)
Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V; Idle 150cd/m2: Ø2.25 (2.06-3.04)
Dell 14 Plus 2-in-1 Ryzen AI 7 350, Radeon 860M; Idle 150cd/m2: Ø5.05 (4.85-8.13)
Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V; Cyberpunk 2077 FHD ultra no FSR 150cd: Ø29.1 (28-30.2)
Dell 14 Plus 2-in-1 Ryzen AI 7 350, Radeon 860M; Cyberpunk 2077 FHD ultra no FSR 150cd: Ø36.2 (34.7-38.8)
Power Consumption external Monitor
Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V; Prime95 V2810 Stress (external Monitor): Ø28 (25.1-45.6)
Dell 14 Plus 2-in-1 Ryzen AI 7 350, Radeon 860M; Prime95 V2810 Stress (external Monitor): Ø39.8 (38.6-55.1)
Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V; Cinebench R15 Multi (external Monitor): Ø38.2 (24.6-44.3)
Dell 14 Plus 2-in-1 Ryzen AI 7 350, Radeon 860M; Cinebench R15 Multi (external Monitor): Ø39.2 (36.1-53.6)
Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V; 1280x720 FurMark 1.19 GPU Stress Test (external Monitor): Ø28.7 (25.3-39.8)
Dell 14 Plus 2-in-1 Ryzen AI 7 350, Radeon 860M; 1280x720 FurMark 1.19 GPU Stress Test (external Monitor): Ø39.5 (37.5-54.9)
Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V; Idle 1min (external Monitor): Ø1.799 (1.382-3.44)
Dell 14 Plus 2-in-1 Ryzen AI 7 350, Radeon 860M; Idle 1min (external Monitor): Ø3.91 (3.36-9.11)
Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V; Cyberpunk 2077 FHD ultra no FSR (external Monitor): Ø27 (26.2-28.1)
Dell 14 Plus 2-in-1 Ryzen AI 7 350, Radeon 860M; Cyberpunk 2077 FHD ultra no FSR (external Monitor): Ø32.8 (31.7-35.4)
Battery Life
| Dynabook Portege Z40L-N Core Ultra 7 258V, Arc 140V, 56 Wh | Dynabook Portégé X40-K i7-1260P, Iris Xe G7 96EUs, 53 Wh | LG Gram Style 14Z90RS-G.AD7AG i7-1360P, Iris Xe G7 96EUs, 72 Wh | Lenovo ThinkBook 14 Gen 8 21SJ007SGE Ultra 7 255H, Arc 140T, 45 Wh | Dell Pro 14 Premium Core Ultra 7 268V, Arc 140V, 60 Wh | HP EliteBook X G1i 14 AI Core Ultra 7 268V, Arc 140V, 68 Wh | |
|---|---|---|---|---|---|---|
| Battery Runtime | -52% | -39% | -62% | -20% | -3% | |
| WiFi v1.3 | 1143 | 554 -52% | 700 -39% | 435 -62% | 909 -20% | 1110 -3% |
| H.264 | 603 | |||||
| Load | 145 | 48 |
Notebookcheck Rating
Dynabook Portege Z40L-N
- 07/29/2025 v8
Allen Ngo
Office - Weighted Average
Total Sustainability Score: Potential Competitors in Comparison
Image | Model / Review | Price | Weight | Height | Display |
|---|---|---|---|---|---|
1. 86.2%  | Dynabook Portege Z40L-N Intel Core Ultra 7 258V ⎘ Intel Arc Graphics 140V ⎘ 16 GB Memory | Amazon: 1. $39.95 BoxWave Keyboard Compatible ... 2. $39.95 BoxWave Keyboard Compatible ... List Price: 2200 USD | 961 g | 18.9 mm | 14.00" 1920x1200 162 PPI IPS |
2. 84.3% v7 (old)  | Dynabook Portégé X40-K Intel Core i7-1260P ⎘ Intel Iris Xe Graphics G7 96EUs ⎘ 16 GB Memory, 512 GB SSD | Amazon: 1. $50.00 English US Laptop Keyboard f... 2. $54.99 Broonel - Contour Series - P... 3. $45.00 English US Laptop Keyboard f... List Price: 1450 USD | 1.5 kg | 17.9 mm | 14.00" 1920x1080 157 PPI IPS |
3. 90% v7 (old)  | LG Gram Style 14Z90RS-G.AD7AG Intel Core i7-1360P ⎘ Intel Iris Xe Graphics G7 96EUs ⎘ 32 GB Memory, 1024 GB SSD | List Price: 1700€ | 987 g | 16.5 mm | 14.00" 2880x1800 243 PPI OLED |
4. 83.9%  | Lenovo ThinkBook 14 Gen 8 21SJ007SGE Intel Core Ultra 7 255H ⎘ Intel Arc Graphics 140T ⎘ 32 GB Memory, 1024 GB SSD | Amazon: $1,149.00 List Price: 1090 Euro | 1.5 kg | 20.8 mm | 14.00" 1920x1200 162 PPI IPS LED |
5. 86.4%  | Dell Pro 14 Premium Intel Core Ultra 7 268V ⎘ Intel Arc Graphics 140V ⎘ 32 GB Memory, 1024 GB SSD | Amazon: 1. $39.99 Smatree Hard EVA Protective ... 2. $55.99 Laptop Cover for Dell Pro 14... 3. $22.99 Alapmk Protective Case for D... List Price: 2500 USD | 1.3 kg | 17.95 mm | 14.00" 2880x1800 243 PPI OLED |
6. 85.1%  | HP EliteBook X G1i 14 AI Intel Core Ultra 7 268V ⎘ Intel Arc Graphics 140V ⎘ 32 GB Memory | Amazon: $2,230.53 List Price: 3300 USD | 1.2 kg | 15 mm | 14.00" 1920x1200 162 PPI IPS |
Transparency
The selection of devices to be reviewed is made by our editorial team. The test sample was provided to the author as a loan by the manufacturer or retailer for the purpose of this review. The lender had no influence on this review, nor did the manufacturer receive a copy of this review before publication. There was no obligation to publish this review. We never accept compensation or payment in return for our reviews. As an independent media company, Notebookcheck is not subjected to the authority of manufacturers, retailers or publishers.
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Every year, Notebookcheck independently reviews hundreds of laptops and smartphones using standardized procedures to ensure that all results are comparable. We have continuously developed our test methods for around 20 years and set industry standards in the process. In our test labs, high-quality measuring equipment is utilized by experienced technicians and editors. These tests involve a multi-stage validation process. Our complex rating system is based on hundreds of well-founded measurements and benchmarks, which maintains objectivity. Further information on our test methods can be found here.
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After graduating with a B.S. in environmental hydrodynamics from the University of California, I studied reactor physics to become licensed by the U.S. NRC to operate nuclear reactors. There's a striking level of appreciation you gain for everyday consumer electronics after working with modern nuclear reactivity systems astonishingly powered by computers from the 80s. When I'm not managing day-to-day activities and US review articles on Notebookcheck, you can catch me following the eSports scene and the latest gaming news.
