Intel Core i5-8257U vs Intel Core i5-8279U

Intel Core i5-8257U

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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 i5-8279U

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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 i5-8257UIntel 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 i5-8400H (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 i5-8279U2400 - 4100 MHz4 / 86 MB
Intel Core i5-8259U (compare)2300 - 3800 MHz4 / 86 MB
» Intel Core i5-8257U1400 - 3900 MHz4 / 86 MB
Intel Core i5-9400H (compare)2500 - 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 i5-8279U2400 - 4100 MHz4 / 86 MB
Intel Core i5-8259U (compare)2300 - 3800 MHz4 / 86 MB
Intel Core i5-8257U1400 - 3900 MHz4 / 86 MB
1400 - 3900 MHz2400 - 4100 MHz
256 KB256 KB
1 MB1 MB
6 MB6 MB
4 / 84 / 8
15 28
14 14
100 °C100 °C
FCBGA1528FCBGA1528
Dual-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 Iris Plus Graphics 645 (300 - 1050 MHz)Intel Iris Plus Graphics 655 (300 - 1150 MHz)
Intel Core i5 i5-8257UIntel Core i5 i5-8279U

Performance Rating - CB R15 + R20 + 7-Zip + X265 + Blender + 3DM11 CPU
44.1 pt (48%)
Cinebench R20 - CPU (Single Core)
388 Points (75%)
421 Points (82%)
Cinebench R20 - CPU (Multi Core)
1494 Points (17%)
1717 Points (19%)
Cinebench R15 - CPU Multi 64Bit
638 Points (15%)
0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600610620630640Tooltip
min: 743     avg: 750     median: 750 (17%)     max: 757 Points
0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600610620630640650660670680690700710720730740750760Tooltip
Cinebench R15 - CPU Single 64Bit
159 Points (73%)
min: 166     avg: 168     median: 167.5 (77%)     max: 169 Points
Cinebench R11.5 - CPU Multi 64Bit
8.3 Points (21%)
Cinebench R11.5 - CPU Single 64Bit
1.9 Points (78%)
Cinebench R10 - Rendering Single 32Bit
6551 Points (67%)
Cinebench R10 - Rendering Multiple CPUs 32Bit
24096 Points (41%)
wPrime 2.0x - 1024m *
266 seconds (3%)
wPrime 2.0x - 32m *
8.6 seconds (2%)
WinRAR - Result
5862 KB/s (69%)
7-Zip 18.03 - 7z b 4
19620 MIPS (21%)
22683 MIPS (24%)
7-Zip 18.03 - 7z b 4 -mmt1
4083 MIPS (27%)
4276 MIPS (28%)
X264 HD Benchmark 4.0 - Pass 2
45.7 fps (29%)
X264 HD Benchmark 4.0 - Pass 1
190 fps (67%)
HWBOT x265 Benchmark v2.2 - 4k Preset
5.3 fps (19%)
01020Tooltip
6 fps (22%)
01020Tooltip
Blender 2.79 - BMW27 CPU *
714 Seconds (5%)
627 Seconds (4%)
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 11 - Performance Physics 1280x720
7866 points (38%)
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
8936 Points (30%)
10411 Points (35%)
Geekbench 4.4 - 64 Bit Single-Core Score
4608 Points (73%)
4850 Points (77%)
Geekbench 4.4 - 64 Bit Multi-Core Score
16580 Points (29%)
17643 Points (31%)
Geekbench 5 - 64 Bit Single-Core Score
989 Points (74%)
Geekbench 5 - 64 Bit Multi-Core Score
4181 Points (26%)
Mozilla Kraken 1.1 - Total Score *
901 ms (2%)
740 ms (1%)
Octane V2 - Total Score
40071 Points (76%)
44259 Points (84%)

Average Benchmarks Intel Core i5-8257U → 100%

Average Benchmarks Intel Core i5-8279U → 104%

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

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> Notebook / Laptop Reviews and News > Benchmarks / Tech > Processor Comparison - Head 2 Head
Redaktion, 2017-09- 8 (Update: 2017-09-11)