Intel Core i7-8550U vs Intel Core i5-8400

Intel Core i7-8550U

► remove Intel 8550U

The Intel Core i7-8550U is a power efficient quad-core SoC for notebooks and Ultrabooks based on the Kaby Lake Refresh generation and was announced in August 2017. Contrary to its direct predecessors Core i7-7500U and i5-7260U, respectively, which were still dual-cores, the i7-8550U is equipped with four cores but at a lower base frequency of 1.8 GHz. The Turbo Boost is not specified yet, but should be at least 3.7 - 4 GHz and therefore also offer good short term single core speeds. The GPU is now named Intel UHD Graphics 620 but otherwise identical to the Intel HD Graphics 620. The integrated memory controller supports DDR4-2400 / LPDDR3-2133 and dual channel memory.

Architecture

Intel basically uses the same micro architecture compared to Skylake, 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

The performance of the i7-8550U depends on the cooling solution of the laptop and the defined TDP limits for short and long term performance. This leads to big differences in our benchmark scores ranging from the 15 Watt reference by Intel up to the 23% higher score of the Inspiron 17-7773 in the Cinebench R15 Multi benchmark. Especially when taxing the CPU for longer periods, these differences can be even higher.

In our usual benchmarks, the average i7-8550U is as fast as the 35 Watt rated Core i5-7440HQ. For single thread performance, the high Turbo Boost frequency helps achieving one of the highest scores for mobile CPUs.

Graphics

The integrated Intel UHD Graphics 620 (Intel Gen 9.5) is untouched from the 8th Gen Kaby Lake chips. With fast dual-channel memory it can reach the performance of a dedicated GeForce 920M.

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 (14nm+), the same as the 7th Gen Kaby Lake processors. Intel still specifies the TDP with 15 Watts, which is typical for ULV chips. Depending on the usage scenario, the TDP can vary between 7.5 (cTDP Down) and 25 Watts.

Intel Core i5-8400

► remove Intel 8400

The Intel Core i5-8400 is a mid-range 6-core CPU. The processor belongs to the Coffee Lake generation and was presented in September 2017. It does not support Hyper-Threading, which means it can run six threads simultaneously. The base clock rate is 2.8 GHz and the CPU can speed up to 4.0 GHz under high load. Despite belonging to the new generation of CPUs, the Core i5-8400 is manufactured in an improved 14nm process.

Performance

The processor offers a strong performance increase compared to the Core i5-7400 due to its two additional cores. Single-core performance has not improved significantly compared to its Kaby Lake predecessor. As a mid-range model, the Core i5-8400 should be suitable for demanding games and programs.

Graphics

The integrated Intel UHD Graphics 630 iGPU is supposed to offer higher performance as its clock rate has been increased by 50 MHz. The build is identical to that of the Intel HD Graphics 630. We do expect a performance improvement, but as a low-end solution it will probably only display current games smoothly at reduced details - if at all.

Power Consumption

Intel specifies the TDP with 65 watts. Therefore, well-dimensioned cooling systems should easily manage to deal with the created heat. We expect increased efficiency due to the higher performance.

Intel Core i7-8550UIntel Core i5-8400
Intel Kaby Lake RefreshIntel Core i5 (Desktop)
Kaby Lake RefreshCoffee Lake-S
: Core i5 (Desktop) Coffee Lake-S
Intel Core i7-8650U (compare)1900 - 4200 MHz4 / 88 MB
» Intel Core i7-8550U1800 - 4000 MHz4 / 88 MB
Intel Core i5-8350U (compare)1700 - 3600 MHz4 / 86 MB
Intel Core i5-8250U (compare)1600 - 3400 MHz4 / 86 MB
Intel Core i3-8130U (compare)2200 - 3400 MHz2 / 44 MB
Intel Pentium Gold 4417U (compare)2300 MHz2 / 42 MB
Intel Core i5-9600K (compare)3700 - 4600 MHz6 / 69 MB
Intel Core i5-8600K (compare)3600 - 4300 MHz6 / 69 MB
Intel Core i5-8500 (compare)3000 - 4100 MHz6 / 69 MB
» Intel Core i5-84002800 - 4000 MHz6 / 69 MB
Intel Core i5-8500T (compare)2100 - 3500 MHz6 / 69 MB
1800 - 4000 MHz2800 - 4000 MHz
256 KB384 KB
1 MB1.5 MB
8 MB9 MB
4 / 86 / 6
15 65
14 14
BGA1356FCLGA1151
Dual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NIDual-Channel DDR3(L)-1600/DDR4-2666 Memory Controller, HyperThreading, AVX, AVX2, AES-NI, TSX-NI, Quick Sync, Virtualization, vPro
iGPUIntel UHD Graphics 620 (300 - 1150 MHz)Intel UHD Graphics 630 (350 - 1050 MHz)
$409 U.S.
Intel Core i5 (Desktop) 8400

Cinebench R20 - CPU (Single Core)
383 Points (75%)
Cinebench R20 - CPU (Multi Core)
1138 Points (13%)
Cinebench R15 - CPU Multi 64Bit
min: 301     avg: 569     median: 551 (13%)     max: 761 Points
0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600610620630640650660670680690700710720730740750760770Tooltip
171%
8400 +
min: 939     avg: 943     median: 941 (22%)     max: 949 Points
0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600610620630640650660670680690700710720730740750760770780790800810820830840850860870880890900910920930940950Tooltip
Cinebench R15 - CPU Single 64Bit
min: 108     avg: 160     median: 163.5 (75%)     max: 172 Points
104%
8400 +
min: 167     avg: 170     median: 169.5 (78%)     max: 172 Points
Cinebench R11.5 - CPU Multi 64Bit
min: 4.38     avg: 6.3     median: 6.1 (16%)     max: 8.56 Points
180%
8400 +
11 Points (29%)
Cinebench R11.5 - CPU Single 64Bit
min: 1.43     avg: 1.8     median: 1.9 (77%)     max: 1.95 Points
101%
8400 +
1.9 Points (77%)
Cinebench R10 - Rendering Single 32Bit
min: 4202     avg: 6333     median: 6423 (66%)     max: 8211 Points
min: 6356     avg: 6364     median: 6363.5 (65%)     max: 6371 Points
Cinebench R10 - Rendering Multiple CPUs 32Bit
min: 11694     avg: 17867     median: 17321.5 (29%)     max: 24180 Points
178%
8400 +
min: 30658     avg: 30790     median: 30789.5 (52%)     max: 30921 Points
Cinebench R10 - Rendering Multiple CPUs 64Bit
min: 12279     avg: 23153     median: 22717 (30%)     max: 31667 Points
Cinebench R10 - Rendering Single CPUs 64Bit
min: 6737     avg: 8065     median: 8370.5 (78%)     max: 8436 Points
wPrime 2.0x - 1024m *
min: 257.514     avg: 352     median: 366.7 (4%)     max: 435 seconds
102%
8400 +
192 seconds (2%)
wPrime 2.0x - 32m *
min: 7.047     avg: 9.8     median: 9.9 (2%)     max: 12.7 seconds
101%
8400 +
6.2 seconds (1%)
wPrime 1.55 - 1024m *
847 seconds (3%)
wPrime 1.55 - 32m *
26.3 seconds (14%)
WinRAR - Result
min: 3847     avg: 4487     median: 4374 (51%)     max: 5287 KB/s
118%
8400 +
5173 KB/s (61%)
X264 HD Benchmark 4.0 - Pass 2
min: 32     avg: 35.3     median: 33.1 (21%)     max: 41 fps
185%
8400 +
61.4 fps (39%)
X264 HD Benchmark 4.0 - Pass 1
min: 143.6     avg: 154     median: 147.9 (53%)     max: 178 fps
151%
8400 +
224 fps (80%)
HWBOT x265 Benchmark v2.2 - 4k Preset
min: 3.88     avg: 4.2     median: 4.2 (15%)     max: 4.43 fps
TrueCrypt - Serpent Mean 100MB
min: 0.357     avg: 0.4     median: 0.4 (23%)     max: 0.469 GB/s
116%
8400 +
0.5 GB/s (26%)
TrueCrypt - Twofish Mean 100MB
min: 0.583     avg: 0.7     median: 0.7 (0%)     max: 0.793 GB/s
113%
8400 +
0.8 GB/s (0%)
TrueCrypt - AES Mean 100MB
min: 3.3     avg: 4.2     median: 4.3 (22%)     max: 4.6 GB/s
116%
8400 +
5 GB/s (26%)
Blender 2.79 *
min: 841.1     avg: 889     median: 888.9 (6%)     max: 936.7 Seconds
103%
8400 +
488 Seconds (3%)
3DMark 06 - CPU
min: 4534     avg: 5951     median: 5845 (39%)     max: 7795 Points
162%
8400 +
9474 Points (63%)
Super Pi mod 1.5 XS 1M *
min: 9     avg: 10.5     median: 9.3 (2%)     max: 17.455 Seconds
100%
8400 +
9.5 Seconds (2%)
Super Pi mod 1.5 XS 2M *
min: 20     avg: 23     median: 21.2 (1%)     max: 32.72 Seconds
100%
8400 +
21.6 Seconds (1%)
Super Pi Mod 1.5 XS 32M *
min: 509.5     avg: 575     median: 536 (2%)     max: 740.35 Seconds
100%
8400 +
526 Seconds (2%)
3DMark Vantage - P CPU no PhysX 1280x1024
21623 Points (30%)
163%
8400 +
35310 Points (49%)
3DMark 11 - Performance Physics 1280x720
min: 3961     avg: 6671     median: 6663 (33%)     max: 9527 points
142%
8400 +
min: 9057     avg: 9453     median: 9453 (46%)     max: 9849 points
3DMark - Ice Storm Standard Physics 1280x720
min: 16314     avg: 42803     median: 44682 (29%)     max: 55226 Points
3DMark - Ice Storm Extreme Physics 1920x1080
min: 16312     avg: 37536     median: 36876 (44%)     max: 51937 Points
179%
8400 +
65891 Points (78%)
3DMark - Ice Storm Unlimited Physics 1280x720 offscreen
min: 27917     avg: 50269     median: 52842 (61%)     max: 58213 Points
132%
8400 +
69971 Points (81%)
3DMark - Cloud Gate Standard Physics 1280x720
min: 3437     avg: 5736     median: 5675 (14%)     max: 7725 Points
139%
8400 +
7891 Points (20%)
3DMark - Fire Strike Physics 1920x1080
min: 3961     avg: 8258     median: 8409 (29%)     max: 11110 Points
143%
8400 +
min: 10911     avg: 11774     median: 12066 (41%)     max: 12346 Points
Geekbench 3 - 32 Bit Multi-Core Score
min: 8918     avg: 12315     median: 12327.5 (22%)     max: 14144 Points
Geekbench 3 - 32 Bit Single-Core Score
min: 2471     avg: 3671     median: 3770 (78%)     max: 4020 Points
Geekbench 3 - 64 Bit Multi-Core Score
min: 11637     avg: 12834     median: 12833.5 (20%)     max: 14030 Points
151%
8400 +
19334 Points (30%)
Geekbench 3 - 64 Bit Single-Core Score
min: 3784     avg: 3949     median: 3948.5 (80%)     max: 4113 Points
108%
8400 +
4283 Points (87%)
Geekbench 4.0 - Compute OpenCL Score
min: 22560     avg: 37002     median: 33412 (12%)     max: 76321 Points
622%
8400 +
207800 Points (72%)
Geekbench 4.0 - 64 Bit Multi-Core Score
min: 10747     avg: 13316     median: 13251 (37%)     max: 15294 Points
147%
8400 +
19500 Points (54%)
Geekbench 4.0 - 64 Bit Single-Core Score
min: 4439     avg: 4686     median: 4699 (74%)     max: 4858 Points
106%
8400 +
4996 Points (79%)
Geekbench 4.4 - 64 Bit Single-Core Score
min: 4555     avg: 4858     median: 4900 (77%)     max: 4997 Points
104%
8400 +
5104 Points (81%)
Geekbench 4.4 - 64 Bit Multi-Core Score
min: 10869     avg: 14247     median: 15117 (26%)     max: 16294 Points
136%
8400 +
20500 Points (36%)
Geekbench 5 - 64 Bit Single-Core Score
1081 Points (80%)
Geekbench 5 - 64 Bit Multi-Core Score
3141 Points (19%)
Mozilla Kraken 1.1 - Total Score *
min: 876.6     avg: 1091     median: 1110.5 (2%)     max: 2114.4 ms
Sunspider - 1.0 Total Score *
min: 63.2     avg: 80.3     median: 71.3 (1%)     max: 122.7 ms
Octane V2 - Total Score
min: 17296     avg: 33448     median: 33496 (64%)     max: 42043 Points
Power Consumption - Prime95 V28,10 Stress Power Consumption (external Monitor) ultra *
100%
1 8550U +
min: 33.7     avg: 47.6     median: 47.6 (13%)     max: 61.4 Watt
79%
1 8400 +
115 Watt (31%)
Power Consumption - Cinebench R15 Multi Power Consumption (external Monitor) ultra *
100%
1 8550U +
min: 28.9     avg: 41.3     median: 31.9 (8%)     max: 63.2 Watt
81%
1 8400 +
97 Watt (26%)

Average Benchmarks Intel Core i7-8550U → 100%

Average Benchmarks Intel Core i5-8400 → 146%

-
-
* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation

Add one or more devices and compare

In the following list you can select (and also search for) devices that should be added to the comparison. You can select more than one device.

restrict list:

show all (including archived), 2020, 2019
v1.9
Please share our article, every link counts!
> Notebook / Laptop Reviews and News > Benchmarks / Tech > Processor Comparison - Head 2 Head
Redaktion, 2017-09- 8 (Update: 2017-09-11)