Intel Core i5-8400H vs Intel Core i5-8279U

Intel Core i5-8400H

► remove Intel 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 i5-8279U

► remove

The Intel Core i5-8279U is a quad-core SoC for notebooks based on the Coffee Lake architecture and was announced in the first quarter of 2019. Compared to its predecessor Core i5-7287U, the CPU is now a quad-core with Hyperthreading support for the execution of up to 8 threads simultaneously. The base frequency is 2.4 GHz, but the Turbo goes all the way up to 4.1 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 i7 model (e.g. Core i7-8559U) with eDRAM and 28 Watts, the i5-8279U only features 6 MB smart cache and a slower 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 above the 15W model Core i7-8650U. The i5-82769U should still be faster than the i7-8650U in practice thanks to the increased TDP, especially during sustained workloads. Compared to the similar named Intel Core i5-8269U, the 8279U offers a slightly lower performance (-200 MHz Turbo, -100 MHz base) although the name suggests otherwise.

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 300-1150 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 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.

Intel Core i5-8400HIntel Core i5-8279U
Intel Core i5Intel Core i5
Coffee LakeCoffee Lake
: Core i5 Coffee Lake
Intel Core i5-9400H (compare)2500 - 4300 MHz4 / 88 MB
» Intel Core i5-8400H2500 - 4200 MHz4 / 88 MB
Intel Core i5-9300H (compare)2400 - 4100 MHz4 / 88 MB
Intel Core i5-8300H (compare)2300 - 4000 MHz4 / 88 MB
Intel Core i5-8269U (compare)2600 - 4200 MHz4 / 86 MB
Intel Core i5-8279U2400 - 4100 MHz4 / 86 MB
Intel Core i5-8259U (compare)2300 - 3800 MHz4 / 86 MB
Intel Core i5-8257U (compare)1400 - 3900 MHz4 / 86 MB
Intel Core i5-9400H (compare)2500 - 4300 MHz4 / 88 MB
Intel Core i5-8400H2500 - 4200 MHz4 / 88 MB
Intel Core i5-9300H (compare)2400 - 4100 MHz4 / 88 MB
Intel Core i5-8300H (compare)2300 - 4000 MHz4 / 88 MB
Intel Core i5-8269U (compare)2600 - 4200 MHz4 / 86 MB
» Intel Core i5-8279U2400 - 4100 MHz4 / 86 MB
Intel Core i5-8259U (compare)2300 - 3800 MHz4 / 86 MB
Intel Core i5-8257U (compare)1400 - 3900 MHz4 / 86 MB
2500 - 4200 MHz2400 - 4100 MHz
256 KB256 KB
1 MB1 MB
8 MB6 MB
4 / 84 / 8
45 28
14 14
FCBGA1440FCBGA1528
Dual-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 4.2
iGPUIntel UHD Graphics 630 (350 - 1100 MHz)Intel Iris Plus Graphics 655 (300 - 1150 MHz)
Intel Core i5 8400HIntel Core i5 8279U
100 °C

Cinebench R15 - CPU Multi 64Bit
min: 743     avg: 750     median: 750 (17%)     max: 757 Points
Cinebench R15 - CPU Single 64Bit
min: 166     avg: 167.5     median: 167 (77%)     max: 169 Points
Cinebench R11.5 - CPU Multi 64Bit
8.3 Points (19%)
Cinebench R11.5 - CPU Single 64Bit
1.9 Points (97%)
Cinebench R10 - Rendering Single 32Bit
6551 Points (67%)
Cinebench R10 - Rendering Multiple CPUs 32Bit
24096 Points (37%)
wPrime 2.0x - 1024m *
266.1 seconds (3%)
wPrime 2.0x - 32m *
8.6 seconds (2%)
WinRAR - Result
5862 KB/s (69%)
7-Zip 18.03 - 7z b 4
22683 MIPS (22%)
7-Zip 18.03 - 7z b 4 -mmt1
4276 MIPS (62%)
X264 HD Benchmark 4.0 - Pass 2
45.7 fps (1%)
X264 HD Benchmark 4.0 - Pass 1
190 fps (70%)
HWBOT x265 Benchmark v2.2 - 4k Preset
6 fps (20%)
Blender 2.79 *
627 Seconds (7%)
3DMark 06 - CPU
8830 Points (59%)
Super Pi mod 1.5 XS 1M *
9.2 Seconds (2%)
Super Pi mod 1.5 XS 2M *
21.3 Seconds (1%)
Super Pi Mod 1.5 XS 32M *
512 Seconds (2%)
3DMark - Ice Storm Standard Physics 1280x720
21476 Points (14%)
3DMark - Ice Storm Extreme Physics 1920x1080
21581 Points (26%)
3DMark - Ice Storm Unlimited Physics 1280x720 offscreen
24185 Points (28%)
3DMark - Cloud Gate Standard Physics 1280x720
7017 Points (18%)
3DMark - Fire Strike Physics 1920x1080
10411 Points (32%)
Geekbench 4.4 - 64 Bit Single-Core Score
4850 Points (77%)
Geekbench 4.4 - 64 Bit Multi-Core Score
17643 Points (31%)
Mozilla Kraken 1.1 - Total Score *
739.9 ms (1%)
Octane V2 - Total Score
44259 Points (84%)

Average Benchmarks Intel Core i5-8279U → 100%

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

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Redaktion, 2017-09- 8 (Update: 2017-09-11)