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Intel Core i5-8259U

The Intel Core i5-8259U is a quad-core SoC for notebooks based on the Coffee Lake architecture and was announced in April 2018. Compared to its predecessor Core i5-7267U, the CPU is now a quad-core with Hyperthreading support for the execution of up to 8 threads simultaneously. The base frequency is 2.3 GHz, but the Turbo goes all the way up to 3.8 GHz. It is also equipped with an Intel Iris Plus Graphics 655 GPU with 128 MB eDRAM, a dual-channel memory controller (DDR4) as well as VP9 and H.265 video decoding as well as encoding. The chip is still manufactured in a 14nm process with FinFET transistors.

Compared to faster Core i5 and i7 models with eDRAM and 28 Watts, the i5-8259U only features 6 MB smart cache and the slowest clock of the Iris Plus GPU.

Architecture

Intel basically uses the same micro architecture compared to Kaby Lake, so the per-MHz performance does not differ. The manufacturer only reworked the Speed Shift technology for faster dynamic adjustments of voltages and clocks, and the improved 14nm process allows much higher frequencies combined with better efficiency than before.

Performance

Considering the clocks of the Core i5-8259U, its performance should be between the 15W models Core i5-8350U and Core i7-8550U. The i5-8259U should still be faster than the i7-8550U in practice thanks to the increased TDP, especially during sustained workloads.

Graphics

The integrated Intel Iris Plus 655 Graphics is the GT3e model of the Kaby Lake GPU (Intel Gen. 9.5). It has 48 Execution Units running at 300-1050 MHz (slowest clock of the 655, the fastest is 1200 MHz in combination with the i7-8559U) and the performance is comparable to a GeForce 930M or 940MX thanks to fast eDRAM cache. However, there aren't any significant improvements compared to the old Iris Plus 650, so modern games can often not be played smoothly or only at the lowest or medium settings, respectively.

Contrary to Skylake, Kaby lake now also supports H.265/HEVC Main 10 with a 10-bit color depth as well as Google's VP9 codec. The dual-core Kaby Lake processors announced in January should also support HDCP 2.2.

Power Consumption

The chip is manufactured in an improved 14nm process with FinFET transistors, which improves the efficiency even further. Intel specifies the TDP with 28 Watts, which can be reduced to 23 Watts (cTDP Down) depending on the usage scenario. The TDP is pretty high compared to the common 15-Watt TDP for quad-core processors, but allows a better utilization of CPU and GPU Turbo.

SeriesIntel Coffee Lake
CodenameCoffee Lake-U

Series: Coffee Lake Coffee Lake-U

Intel Core i7-8559U compare2.7 - 4.5 GHz4 / 8 cores8 MB L3
Intel Core i7-8557U compare1.7 - 4.5 GHz4 / 8 cores8 MB L3
Intel Core i5-8269U compare2.6 - 4.2 GHz4 / 8 cores6 MB L3
Intel Core i5-8279U compare2.4 - 4.1 GHz4 / 8 cores6 MB L3
Intel Core i5-8259U « 2.3 - 3.8 GHz4 / 8 cores6 MB L3
Intel Core i5-8257U compare1.4 - 3.9 GHz4 / 8 cores6 MB L3
Intel Core i3-8109U compare3 - 3.6 GHz2 / 4 cores4 MB L3
Clock Rate2300 - 3800 MHz
Level 1 Cache256 KB
Level 2 Cache1 MB
Level 3 Cache6 MB
Number of Cores / Threads4 / 8
Power Consumption (TDP = Thermal Design Power)28 Watt
Manufacturing Technology14 nm
Max. Temperature100 °C
SocketFCBGA1528
FeaturesDual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NI, Intel SSE4.1, Intel SSE 4.2
GPUIntel Iris Plus Graphics 655 (300 - 1050 MHz)
64 Bit64 Bit support
Architecturex86
Announcement Date04/03/2018
Product Link (external)ark.intel.com

Benchmarks

Performance Rating - CB R15 + R20 + 7-Zip + X265 + Blender + 3DM11 CPU
27.6 pt (38%)
Cinebench R23 - Cinebench R23 Multi Core
min: 3592     avg: 3792     median: 3728 (3%)     max: 4025 Points
Cinebench R23 - Cinebench R23 Single Core
min: 959     avg: 976     median: 976.5 (42%)     max: 991 Points
Cinebench R20 - Cinebench R20 CPU (Single Core)
min: 369     avg: 378     median: 381 (42%)     max: 386 Points
Cinebench R20 - Cinebench R20 CPU (Multi Core)
min: 1385     avg: 1473     median: 1471 (4%)     max: 1567 Points
Cinebench R15 - Cinebench R15 CPU Multi 64 Bit
min: 575     avg: 622     median: 615 (4%)     max: 687 Points
03570105140175210245280315350385420455490525560595630665Tooltip
Cinebench R15 - Cinebench R15 CPU Single 64 Bit
min: 132     avg: 147.1     median: 148.7 (45%)     max: 154 Points
7-Zip 18.03 - 7-Zip 18.03 Multli Thread 4 runs
min: 17799     avg: 20778     median: 19104.5 (11%)     max: 28824 MIPS
7-Zip 18.03 - 7-Zip 18.03 Single Thread 4 runs
min: 3753     avg: 3949     median: 3975.5 (48%)     max: 4022 MIPS
HWBOT x265 Benchmark v2.2 - HWBOT x265 4k Preset
min: 4.72     avg: 5.2     median: 5.4 (9%)     max: 5.49 fps
0123456789101112Tooltip
R Benchmark 2.5 - R Benchmark 2.5 *
min: 0.738     avg: 0.8     median: 0.8 (17%)     max: 0.818 sec
3DMark 11 - 3DM11 Performance Physics
min: 7105     avg: 8348     median: 8528.5 (23%)     max: 9276 Points
3DMark - 3DMark Ice Storm Physics
min: 47878     avg: 49579     median: 49578.5 (40%)     max: 51279 Points
3DMark - 3DMark Ice Storm Extreme Physics
min: 47855     avg: 49509     median: 49509 (40%)     max: 51163 Points
3DMark - 3DMark Ice Storm Unlimited Physics
min: 17718     avg: 40451     median: 49722 (42%)     max: 53914 Points
3DMark - 3DMark Cloud Gate Physics
min: 5946     avg: 6904     median: 6670.5 (17%)     max: 7927 Points
3DMark - 3DMark Fire Strike Standard Physics
min: 8348     avg: 9726     median: 9743 (17%)     max: 11006 Points
Geekbench 5.5 - Geekbench 5.1 - 5.4 64 Bit Single-Core
min: 948     avg: 961     median: 951 (40%)     max: 984 points
Geekbench 5.5 - Geekbench 5.1 - 5.4 64 Bit Multi-Core
min: 3359     avg: 3602     median: 3607 (6%)     max: 3839 points
Geekbench 5.0 - Geekbench 5.0 64 Bit Single-Core
min: 944     avg: 957     median: 948 (4%)     max: 979 points
Geekbench 5.0 - Geekbench 5.0 64 Bit Multi-Core
min: 3335     avg: 3571     median: 3567 (11%)     max: 3811 points
Geekbench 4.4 - Geekbench 4.1 - 4.4 64 Bit Single-Core
min: 4200     avg: 4265     median: 4211 (42%)     max: 4383 points
Geekbench 4.4 - Geekbench 4.1 - 4.4 64 Bit Multi-Core
min: 13421     avg: 14122     median: 13961 (16%)     max: 14984 points
Mozilla Kraken 1.1 - Kraken 1.1 Total Score *
min: 1010     avg: 1054     median: 1068 (1%)     max: 1095 ms
WebXPRT 3 - WebXPRT 3 Score
min: 173.3     avg: 176.9     median: 176 (37%)     max: 182.4 Points
Power Consumption - Prime95 Power Consumption - external Monitor *
min: 36.1     avg: 42     median: 39.5 (7%)     max: 50.3 Watt
051015202530354045505560Tooltip
Power Consumption - Cinebench R15 Multi Power Consumption - external Monitor *
min: 37.6     avg: 44.2     median: 43.7 (8%)     max: 51.3 Watt
051015202530354045505560Tooltip
Power Consumption - Idle Power Consumption - external Monitor *
13.9 Watt (10%)
0123456789101112131415Tooltip
Power Consumption - Cinebench R15 Multi Power Efficiency - external Monitor
min: 12.4     avg: 13.9     median: 13.9 (10%)     max: 15.3 Points per Watt
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

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Reviews for the Intel Core i5-8259U processor

ACEMagician ACE-CK10-8259U

ACEMagician ACE-CK10-8259U mini PC review - quiet office PC with space for up to three SSDs

The ACEMagician ACE-CK10-8259U is a small office PC based on a native 4-core processor. However, its processor is still part of the Coffee Lake generation, whic...
Intel Core i5-8259U | Intel Iris Plus Graphics 655 | | 449 g
Geekom Mini IT8 SFF desktop hands-on

Geekom Mini IT8 SFF desktop hands-on

The Geekom Mini IT8 is a compact desktop. Despite its tiny footprint, it packs some decent power thanks to its quad-core CPU and Intel Iris Plus Graphics 655 iG...
Intel Core i5-8259U | Intel Iris Plus Graphics 655 | | 586 g
Chuwi CoreBook X Pro laptop review: 120 Hz display for cheap

Chuwi CoreBook X Pro laptop review: 120 Hz display for cheap

The CoreBook X Pro is the least expensive 15.6-inch laptop you can find with a 120 Hz panel. The catch, however, is you'll have to deal with substantial cut cor...
Intel Core i5-8259U | Intel Iris Plus Graphics 655 | 15.60" | 1.8 kg
Chuwi CoreBook X Laptop Review: Like a Huawei MateBook, But Cheaper

Chuwi CoreBook X Laptop Review: Like a Huawei MateBook, But Cheaper

The CoreBook X is a good solution for those who want to maximize display quality and colors for a budget price. Nonetheless, there are a bunch of smaller detail...
Intel Core i5-8259U | Intel Iris Plus Graphics 655 | 14.00" | 1.5 kg
GMK NucBox 2 Mini PC Review: Reasonably Priced with Good Upgradeability

GMK NucBox 2 Mini PC Review: Reasonably Priced with Good Upgradeability

The GMK uses the same 8th gen Intel CPU as the 2018 MacBook Pro 13 for less than $500 USD retail. Build quality and performance impressions are solid even if a ...
Intel Core i5-8259U | Intel Iris Plus Graphics 655 | | 430 g

Apple MacBook Pro 13 2018 Touchbar i5: Intel Iris Plus Graphics 655, 13.30", 1.4 kg
  Review » Apple MacBook Pro 13 2018 (Touch Bar, i5) Laptop Review

Chuwi CoreBook X Pro: Intel Iris Plus Graphics 655, 15.60", 1.8 kg
  External Review » Chuwi CoreBook X Pro

Chuwi CoreBook X: Intel Iris Plus Graphics 655, 14.00", 1.5 kg
  External Review » Chuwi CoreBook X

Apple MacBook Pro 13 2018 Touchbar i5: Intel Iris Plus Graphics 655, 13.30", 1.4 kg
  External Review » Apple MacBook Pro 13 2018 Touchbar i5

Chuwi CoreBook X Pro: Intel Iris Plus Graphics 655, 15.60", 1.8 kg
   » Official Chuwi CoreBook X Pro page is misleading and embarrassingly full of errors

Chuwi CoreBook X: Intel Iris Plus Graphics 655, 14.00", 1.5 kg
   » The $500 USD Chuwi CoreBook X is actually not a terrible Huawei MateBook X knockoff

GMK NucBox 2: Intel Iris Plus Graphics 655, 0.4 kg
   » GMK NucBox and NucBox 2 mini PCs are 20 percent off for Amazon Prime Day

   » GMK NucBox 2 mini PC is only $399 USD for a limited time with 8 GB RAM and 256 GB NVMe SSD

Please share our article, every link counts!

» Mobile CPU Comparison
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» Mobile Processors - Benchmarklist
Benchmarklist of all known CPUs that are used in laptops (desktop and laptop CPUs)

Other CPUs of the series Coffee Lake

» Intel Core i9-9900KS
   8x 4 GHz - 5 GHz
» Intel Core i9-9900K
   8x 3.6 GHz - 5 GHz
» Intel Core i9-9980HK
   8x 2.4 GHz - 5 GHz
» Intel Core i7-9700K
   8x 3.6 GHz - 4.9 GHz
» Intel Core i9-9880H
   8x 2.3 GHz - 4.8 GHz
» Intel Core i7-8086K
   6x 3.7 GHz - 5 GHz
» Intel Core i7-8700K
   6x 3.7 GHz - 4.7 GHz
» Intel Xeon E-2176G
   6x 3.7 GHz - 4.7 GHz
» Intel Core i7-9700
   8x 3 GHz - 4.7 GHz
» Intel Core i9-8950HK
   6x 2.9 GHz - 4.8 GHz
» Intel Xeon E-2186M
   6x 2.9 GHz - 4.8 GHz
» Intel Xeon E-2276M
   6x 2.8 GHz - 4.7 GHz
» Intel Core i7-8700
   6x 3.2 GHz - 4.6 GHz
» Intel Core i5-9600K
   6x 3.7 GHz - 4.6 GHz
» Intel Core i7-9850H
   6x 2.6 GHz - 4.6 GHz
» Intel Core i7-9750H
   6x 2.6 GHz - 4.5 GHz
» Intel Core i9-9900T
   8x 2.1 GHz - 4.4 GHz
» Intel Xeon E-2176M
   6x 2.7 GHz - 4.4 GHz
» Intel Core i7-8850H
   6x 2.6 GHz - 4.3 GHz
» Intel Core i5-8600K
   6x 3.6 GHz - 4.3 GHz
» Intel Core i5-8500
   6x 3 GHz - 4.1 GHz
» Intel Core i7-8750H
   6x 2.2 GHz - 4.1 GHz
» Intel Core i5-8400
   6x 2.8 GHz - 4 GHz
» Intel Core i5-8500T
   6x 2.1 GHz - 3.5 GHz
» Intel Core i5-9400H
   4x 2.5 GHz - 4.3 GHz
» Intel Core i5-9300HF
   4x 2.4 GHz - 4.1 GHz
» Intel Core i5-9300H
   4x 2.4 GHz - 4.1 GHz
» Intel Core i5-8400H
   4x 2.5 GHz - 4.2 GHz
» Intel Core i7-8559U
   4x 2.7 GHz - 4.5 GHz
» Intel Core i5-8300H
   4x 2.3 GHz - 4 GHz
» Intel Core i5-9400F
   6x 2.9 GHz - 4.1 GHz
» Intel Core i3-9100F
   4x 3.6 GHz - 4.2 GHz
» Intel Core i7-8557U
   4x 1.7 GHz - 4.5 GHz
» Intel Core i5-8269U
   4x 2.6 GHz - 4.2 GHz
» Intel Core i5-8279U
   4x 2.4 GHz - 4.1 GHz
» Intel Core i5-8259U
   4x 2.3 GHz - 3.8 GHz
» Intel Core i5-8257U
   4x 1.4 GHz - 3.9 GHz
» Intel Core i5-8260U
   4x 1.6 GHz - 3.9 GHz
» Intel Core i3-8109U
   2x 3 GHz - 3.6 GHz
» Intel Core i3-8100H
   4x 3 GHz

Surrounding CPUs

+ Intel Core i7-6820HQ
   4x 2.7 GHz - 3.6 GHz
+ Intel Core i7-6770HQ
   4x 2.6 GHz - 3.5 GHz
+ Intel Core i7-1160G7
   4x 2.1 GHz - 4.4 GHz
+ Intel Core i7-1065G7
   4x 1.3 GHz - 3.9 GHz
+ AMD Ryzen 7 3780U
   4x 2.3 GHz - 4 GHz
» Intel Core i5-8259U
   4x 2.3 GHz - 3.8 GHz
- Intel Core i5-8257U
   4x 1.4 GHz - 3.9 GHz
- Intel Core i7-4900MQ
   4x 2.8 GHz - 3.8 GHz
- Intel Core i7-10610U
   4x 1.8 GHz - 4.9 GHz
- Intel Core i7-10510U
   4x 1.8 GHz - 4.9 GHz
- Intel Core i7-4960HQ
   4x 2.6 GHz - 3.8 GHz
> Expert Reviews and News on Laptops, Smartphones and Tech Innovations > Benchmarks / Tech > Notebook Processors > Intel Core i5-8259U SoC - Benchmarks and Specs
Klaus Hinum (Update: 2018-07-17)