Intel Core i5-9400H vs Intel Core i5-8259U

Intel Core i5-9400H

► remove Intel 9400H

The Intel Core i5-9400H is a high-end processor for laptops with four cores based on the Coffee Lake architecture (2019 refresh, CFL-HR). The processor clocks at between 2.5 and 4.3 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. Compared to the predecessor, the Core i5-8400H from 2018, the 9300H is only clocked slightly higher (+100 MHz CPU Turbo, +50 MHz GPU).

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).


The Intel Core i5-9400H should perform similar as the older Core i7-7920HQ (3.1 - 4.1 GHz). The faster Coffee Lake CPUs, like the Core i7-9750H offers two additional cores and is therefore up to 50% faster in multithreaded benchmarks. Still, the performance of the i5-9400H should be sufficient for even demanding applications and games.


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. 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.

Beware, the CPU was not yet released at the time of writing and the information is based on leaks and early price list information (e.g. by Intel or on Baidu).

Intel Core i5-8259U

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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.


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.


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.


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.

Intel Core i5-9400HIntel Core i5-8259U
Intel Core i5Intel Core i5
Coffee LakeCoffee Lake
: Core i5 Coffee Lake
» Intel Core i5-9400H2500 - 4300 MHz4 / 88 MB
Intel Core i5-8400H (compare)2500 - 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 i5-8259U2300 - 3800 MHz4 / 86 MB
Intel Core i5-9400H2500 - 4300 MHz4 / 88 MB
Intel Core i5-8400H (compare)2500 - 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 i5-8259U2300 - 3800 MHz4 / 86 MB
2500 - 4300 MHz2300 - 3800 MHz
256 KB256 KB
1 MB1 MB
8 MB6 MB
4 / 84 / 8
45 28
14 14
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 - 1050 MHz)
100 °C
Intel Core i5 8259U

Cinebench R15 - CPU Multi 64Bit
min: 608     avg: 647.5     median: 647.5 (15%)     max: 687 Points
Cinebench R15 - CPU Single 64Bit
154 Points (71%)
7-Zip 18.03 - 7z b 4
21107 MIPS (45%)
7-Zip 18.03 - 7z b 4 -mmt1
3981 MIPS (58%)
X264 HD Benchmark 4.0 - Pass 2
38.5 fps (1%)
X264 HD Benchmark 4.0 - Pass 1
162.3 fps (60%)
HWBOT x265 Benchmark v2.2 - 4k Preset
4.7 fps (26%)
Blender 2.79 *
769.2 Seconds (8%)
3DMark 11 - Performance Physics 1280x720
9037 points (49%)
3DMark - Ice Storm Unlimited Physics 1280x720 offscreen
17718 Points (20%)
3DMark - Cloud Gate Standard Physics 1280x720
6654 Points (17%)
3DMark - Fire Strike Physics 1920x1080
8348 Points (31%)

Average Benchmarks Intel Core i5-8259U → 100%

* 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)