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Intel Core i5-8400H vs Intel Core i5-8257U vs Intel Core i7-8557U

Intel Core i5-8400H

► remove from comparison Intel i5-8400H

The Intel Core i5-8400H is a high-end processor for laptops with four cores based on the Coffee Lake architecture and will be announced early 2018. The processor clocks at between 2.5 and 4.2 GHz (4.1 with 4 cores) and can execute up to eight threads simultaneously thanks to Hyper-Threading. According to Intel, the CPU is manufactured in an improved 14nm (14nm++) process.

The Coffee Lake architecture is similar to Kaby Lake and differs only in the amount of cores (now six cores for the high end versions) and the improved 14nm process (14nm++ according to Intel).

Performance

The Intel Core i5-8400H should perform similar as the older Core i7-7920HQ (3.1 - 4.1 GHz). The faster Coffee Lake CPUs, like the Core i7-8750H offers two additional cores and is therefore up to 50% faster in multithreaded benchmarks. Still, the performance of the i5-8400H should be sufficient for even demanding applications and games.

Graphics

The integrated Intel UHD Graphics 630 iGPU is supposed to offer a slightly higher performance as its clock rate has been increased by 50 MHz (rumored). The architecture 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 45 watts and therefore the i5 is only suited for big laptops with good cooling solutions. Using cTDP-down, the CPU can also be configured to 35 Watt resulting in a reduced performance.

Intel Core i5-8257U

► remove from comparison

The Intel Core i5-8257U is a quad-core SoC for notebooks based on the Coffee Lake architecture that was announced in the new entry level MacBook Pro 13 in mid 2019. Compared to its predecessor, the CPU is now a quad-core with Hyperthreading support for the execution of up to 8 threads simultaneously. The base frequency is only 1.4 GHz, but the Turbo goes all the way up to 3.9 GHz. It is also equipped with an Intel Iris Plus Graphics 645 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 i7-8557U model with eDRAM and 15 Watts, the i5-8257U 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

Thanks to the relative high Turbo Boost clock, the single thread performance should be very good, but still behind the faster i7 model. The short burst all core performance is clearly better compared to the old dual core predecessors thanks to the additional cores. In sustained workloads, the performance is usually limited by the TDP and cooling. In these workloads the difference to the Core i7 should be also smaller.

Graphics

The integrated Intel Iris Plus 645 Graphics is the GT3e model of the Coffee Lake GPU (Intel Gen. 9.5). It has 48 Execution Units running at 300-1050 MHz 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 15 Watts and therefore suited for thin and light laptops.

Intel Core i7-8557U

► remove from comparison

The Intel Core i7-8557U is a quad-core SoC for notebooks based on the Coffee Lake architecture that was announced in the new entry level MacBook Pro 13 in mid 2019. Compared to its predecessor, the CPU is now a quad-core with Hyperthreading support for the execution of up to 8 threads simultaneously. The base frequency is only 1.7 GHz, but the Turbo goes all the way up to 4.5 GHz. It is also equipped with an Intel Iris Plus Graphics 645 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 slower Core i5 model with eDRAM and 15 Watts, the i5-8557U features 8 MB smart cache and the fastest 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

Clocked at up to 4.5 GHz, the Core i7-8557U should offer an excellent single thread performance. The multi core performance is greatly improved due to the two additional cores (compared to the predecessor) but may be limited by the 15 Watt TDP (especially for sustained workloads).

Graphics

The integrated Intel Iris Plus 645 Graphics is the GT3e model of the Coffee Lake GPU (Intel Gen. 9.5). It has 48 Execution Units running at 300-1150 MHz  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 15 Watts and therefore suited for thin and light laptops.

ModelIntel Core i5-8400HIntel Core i5-8257UIntel Core i7-8557U
SeriesIntel Coffee LakeIntel Coffee LakeIntel Coffee Lake
CodenameCoffee Lake-HCoffee Lake-UCoffee Lake-U
Series: Coffee Lake Coffee Lake-U
Intel Core i9-9980HK2.4 - 5 GHz8 / 16 cores16 MB L3
Intel Core i9-9880H2.3 - 4.8 GHz8 / 16 cores16 MB L3
Intel Core i9-8950HK2.9 - 4.8 GHz6 / 12 cores12 MB L3
Intel Xeon E-2186M2.9 - 4.8 GHz6 / 12 cores12 MB L3
Intel Xeon E-2276M2.8 - 4.7 GHz6 / 12 cores12 MB L3
Intel Core i7-9850H2.6 - 4.6 GHz6 / 12 cores12 MB L3
Intel Core i7-9750H2.6 - 4.5 GHz6 / 12 cores12 MB L3
Intel Xeon E-2176M2.7 - 4.4 GHz6 / 12 cores12 MB L3
Intel Core i7-8850H2.6 - 4.3 GHz6 / 12 cores9 MB L3
Intel Core i7-8750H2.2 - 4.1 GHz6 / 12 cores9 MB L3
Intel Core i5-9400H2.5 - 4.3 GHz4 / 8 cores8 MB L3
Intel Core i5-9300HF2.4 - 4.1 GHz4 / 8 cores8 MB L3
Intel Core i5-9300H2.4 - 4.1 GHz4 / 8 cores8 MB L3
Intel Core i5-8400H « 2.5 - 4.2 GHz4 / 8 cores8 MB L3
Intel Core i5-8300H2.3 - 4 GHz4 / 8 cores8 MB L3
Intel Core i3-8100H3 GHz4 / 4 cores8 MB L3
Intel Core i7-8559U2.7 - 4.5 GHz4 / 8 cores8 MB L3
Intel Core i7-8557U1.7 - 4.5 GHz4 / 8 cores8 MB L3
Intel Core i5-8269U2.6 - 4.2 GHz4 / 8 cores6 MB L3
Intel Core i5-8279U2.4 - 4.1 GHz4 / 8 cores6 MB L3
Intel Core i5-8259U2.3 - 3.8 GHz4 / 8 cores6 MB L3
Intel Core i5-8257U « 1.4 - 3.9 GHz4 / 8 cores6 MB L3
Intel Core i3-8109U3 - 3.6 GHz2 / 4 cores4 MB L3
Intel Core i7-8559U2.7 - 4.5 GHz4 / 8 cores8 MB L3
Intel Core i7-8557U « 1.7 - 4.5 GHz4 / 8 cores8 MB L3
Intel Core i5-8269U2.6 - 4.2 GHz4 / 8 cores6 MB L3
Intel Core i5-8279U2.4 - 4.1 GHz4 / 8 cores6 MB L3
Intel Core i5-8259U2.3 - 3.8 GHz4 / 8 cores6 MB L3
Intel Core i5-8257U1.4 - 3.9 GHz4 / 8 cores6 MB L3
Intel Core i3-8109U3 - 3.6 GHz2 / 4 cores4 MB L3
Clock2500 - 4200 MHz1400 - 3900 MHz1700 - 4500 MHz
L1 Cache256 KB256 KB256 KB
L2 Cache1 MB1 MB1 MB
L3 Cache8 MB6 MB8 MB
Cores / Threads4 / 84 / 84 / 8
TDP45 Watt15 Watt28 Watt
Technology14 nm14 nm14 nm
SocketFCBGA1440FCBGA1528FCBGA1528
FeaturesDual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NIDual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NI, Intel SSE4.1, Intel SSE 4.2Dual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NI, Intel SSE4.1, Intel SSE 4.2
iGPUIntel UHD Graphics 630 (350 - 1100 MHz)Intel Iris Plus Graphics 645 (300 - 1050 MHz)Intel Iris Plus Graphics 645 (300 - 1150 MHz)
Architecturex86x86x86
Announced
Manufacturerark.intel.comark.intel.comark.intel.com
max. Temp.100 °C100 °C

Benchmarks

Performance Rating - CB R15 + R20 + 7-Zip + X265 + Blender + 3DM11 CPU - i5-8257U
28.2 pt (39%)
Cinebench R23 - Cinebench R23 Multi Core
4657 Points (4%)
4033 Points (4%)
Cinebench R23 - Cinebench R23 Single Core
1128 Points (48%)
1003 Points (43%)
Cinebench R20 - Cinebench R20 CPU (Single Core)
393 Points (44%)
min: 388     avg: 393     median: 393 (44%)     max: 398 Points
Cinebench R20 - Cinebench R20 CPU (Multi Core)
1793 Points (4%)
min: 1494     avg: 1520     median: 1519.5 (4%)     max: 1545 Points
Cinebench R15 - Cinebench R15 CPU Multi 64 Bit
min: 753     avg: 762     median: 761.5 (5%)     max: 770 Points
min: 629     avg: 634     median: 633.5 (4%)     max: 638 Points
Cinebench R15 - Cinebench R15 CPU Single 64 Bit
min: 168     avg: 170.4     median: 170.4 (51%)     max: 172.8 Points
min: 156     avg: 157.7     median: 157.7 (47%)     max: 159.3 Points
Cinebench R10 - Cinebench R10 Rend. Single (32bit)
6659 Points (40%)
Cinebench R10 - Cinebench R10 Rend. Multi (32bit)
21711 Points (16%)
wPrime 2.10 - wPrime 2.0 1024m *
230.8 s (3%)
wPrime 2.10 - wPrime 2.0 32m *
7.2 s (1%)
WinRAR - WinRAR 4.0
5391 Points (9%)
7-Zip 18.03 - 7-Zip 18.03 Multli Thread 4 runs
22023 MIPS (13%)
19620 MIPS (11%)
7-Zip 18.03 - 7-Zip 18.03 Single Thread 4 runs
4553 MIPS (54%)
4083 MIPS (49%)
X264 HD Benchmark 4.0 - x264 Pass 2
45.3 fps (16%)
X264 HD Benchmark 4.0 - x264 Pass 1
185.2 fps (43%)
HWBOT x265 Benchmark v2.2 - HWBOT x265 4k Preset
6.5 fps (11%)
5.3 fps (9%)
TrueCrypt - TrueCrypt Serpent
0.5 GB/s (0%)
TrueCrypt - TrueCrypt Twofish
0.8 GB/s (13%)
TrueCrypt - TrueCrypt AES
4.6 GB/s (12%)
Blender - Blender 3.3 Classroom CPU *
1151 Seconds (15%)
Blender - Blender 2.79 BMW27 CPU *
596 Seconds (4%)
714 Seconds (5%)
R Benchmark 2.5 - R Benchmark 2.5 *
0.7 sec (15%)
Super Pi mod 1.5 XS 1M - Super Pi mod 1.5 XS 1M *
9 s (2%)
Super Pi Mod 1.5 XS 32M - Super Pi mod 1.5 XS 32M *
498.3 s (2%)
3DMark 11 - 3DM11 Performance Physics
7866 Points (21%)
3DMark - 3DMark Fire Strike Standard Physics
8936 Points (16%)
3DMark - 3DMark Time Spy CPU
2740 Points (12%)
Geekbench 6.2 - Geekbench 6.2 Single-Core
1493 Points (45%)
Geekbench 6.2 - Geekbench 6.2 Multi-Core
4963 Points (20%)
Geekbench 5.5 - Geekbench 5.1 - 5.4 64 Bit Single-Core
1127 Points (48%)
948 Points (40%)
1079 Points (46%)
Geekbench 5.5 - Geekbench 5.1 - 5.4 64 Bit Multi-Core
4352 Points (8%)
3858 Points (7%)
4119 Points (7%)
Geekbench 5.0 - Geekbench 5.0 64 Bit Single-Core
1118 Points (5%)
989 Points (4%)
Geekbench 5.0 - Geekbench 5.0 64 Bit Multi-Core
4211 Points (13%)
4181 Points (13%)
Geekbench 4.4 - Geekbench 4.1 - 4.4 64 Bit Single-Core
4608 Points (46%)
Geekbench 4.4 - Geekbench 4.1 - 4.4 64 Bit Multi-Core
16580 Points (18%)
Mozilla Kraken 1.1 - Kraken 1.1 Total Score *
987 ms (1%)
min: 901     avg: 914     median: 913.5 (1%)     max: 926 ms
Octane V2 - Octane V2 Total Score
49389 Points (44%)
min: 38704     avg: 39388     median: 39387.5 (35%)     max: 40071 Points
WebXPRT 4 - WebXPRT 4 Score
155.3 Points (45%)
WebXPRT 3 - WebXPRT 3 Score
209 Points (44%)
210 Points (44%)
CrossMark - CrossMark Overall
1127 Points (43%)

Average Benchmarks Intel Core i5-8400H → 100% n=2

Average Benchmarks Intel Core i5-8257U → 86% n=2

Average Benchmarks Intel Core i7-8557U → 95% n=2

- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance
1 This benchmark is not used for the average calculation

v1.26
log 28. 14:41:31

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#5 composed specs +0.027s ... 0.028s

#6 did output specs +0s ... 0.029s

#7 getting avg benchmarks for device 9572 +0.002s ... 0.031s

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#12 got single benchmarks 11435 +0.005s ... 0.073s

#13 got avg benchmarks for devices +0s ... 0.073s

#14 min, max, avg, median took s +0.153s ... 0.226s

#15 return log +0s ... 0.226s

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Redaktion, 2017-09- 8 (Update: 2023-07- 1)