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Intel Core i5-8257U

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.

SeriesIntel Coffee Lake
CodenameCoffee Lake-U
Series: Coffee Lake Coffee Lake-U
Intel Core i7-8559U (compare)2700 - 4500 MHz4 / 88 MB
Intel Core i7-8557U (compare)1700 - 4500 MHz4 / 88 MB
Intel Core i5-8269U (compare)2600 - 4200 MHz4 / 86 MB
Intel Core i5-8279U (compare)2400 - 4100 MHz4 / 86 MB
Intel Core i5-8259U (compare)2300 - 3800 MHz4 / 86 MB
» Intel Core i5-8257U1400 - 3900 MHz4 / 86 MB
Intel Core i3-8109U (compare)3000 - 3600 MHz2 / 44 MB
Clock Rate1400 - 3900 MHz
Level 1 Cache256 KB
Level 2 Cache1 MB
Level 3 Cache6 MB
Number of Cores / Threads4 / 8
Power Consumption (TDP = Thermal Design Power)15 Watt
Manufacturing Technology14 nm
Max. Temperature100 °C
SocketFCBGA1528
FeaturesDual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NI, Intel SSE4.1, Intel SSE 4.2
GPUIntel Iris Plus Graphics 645 (300 - 1050 MHz)
64 Bit64 Bit support
Announcement Date07/10/2019
Product Link (external)Intel Coffee Lake i5-8257U

Benchmarks

Performance Rating - CB R15 + R20 + 7-Zip + X265 + Blender + 3DM11 CPU
44.7 pt (49%)
Cinebench R15 - CPU Multi 64Bit
638 Points (15%)
0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600610620630640Tooltip
- Range of benchmark values for this graphics card
- Average benchmark values for this graphics card
* Smaller numbers mean a higher performance

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Reviews for the Intel Coffee Lake i5-8257U processor

Apple MacBook Pro 13 2019 2TB3 (Intel Iris Plus Graphics 645, 13.3")
» Apple MacBook Pro 13 2019: Entry-Level Pro with Touch Bar in review - Review
» The less expensive MacBook Pro 13 is the better choice -

» Mobile CPU Comparison
Comparison of all mobile CPU series

» Mobile Processors - Benchmarklist
Benchmarklist of all known CPUs that are used in laptops (desktop and laptop CPUs)

Other CPUs of the series Intel Coffee Lake

» Intel Coffee Lake i9-9900KS
   4 GHz / 2 MB L2 + 16 MB L3
» Intel Coffee Lake i9-9900K
   3.6 GHz / 2 MB L2 + 16 MB L3
» Intel Coffee Lake i9-9980HK
   2.4 GHz / 2 MB L2 + 16 MB L3
» Intel Coffee Lake i7-9700K
   3.6 GHz / 2 MB L2 + 16 MB L3
» Intel Coffee Lake i9-9880H
   2.3 GHz / 2 MB L2 + 16 MB L3
» Intel Coffee Lake i7-8086K
   3.7 GHz / 1.5 MB L2 + 12 MB L3
» Intel Coffee Lake i7-8700K
   3.7 GHz / 1.5 MB L2 + 12 MB L3
» Intel Coffee Lake i9-8950HK
   2.9 GHz / 1.5 MB L2 + 12 MB L3
» Intel Coffee Lake E-2186M
   2.9 GHz / 1.5 MB L2 + 12 MB L3
» Intel Coffee Lake E-2276M
   2.8 GHz / 1.5 MB L2 + 12 MB L3
» Intel Coffee Lake E-2176G
   3.7 GHz / 1.5 MB L2 + 12 MB L3
» Intel Coffee Lake i7-8700
   3.2 GHz / 1.5 MB L2 + 12 MB L3
» Intel Coffee Lake i5-9600K
   3.7 GHz / 1.5 MB L2 + 9 MB L3
» Intel Coffee Lake i9-9900T
   2.1 GHz / 2 MB L2 + 16 MB L3
» Intel Coffee Lake i7-9850H
   2.6 GHz / 1.5 MB L2 + 12 MB L3
» Intel Coffee Lake i7-9750H
   2.6 GHz + 12 MB L3
» Intel Coffee Lake E-2176M
   2.7 GHz / 1.5 MB L2 + 12 MB L3
» Intel Coffee Lake i7-8850H
   2.6 GHz / 1.5 MB L2 + 9 MB L3
» Intel Coffee Lake i5-8600K
   3.6 GHz / 1.5 MB L2 + 9 MB L3
» Intel Coffee Lake i5-8500
   3 GHz / 1.5 MB L2 + 9 MB L3
» Intel Coffee Lake i7-8750H
   2.2 GHz / 1.5 MB L2 + 9 MB L3
» Intel Coffee Lake i5-8400
   2.8 GHz / 1.5 MB L2 + 9 MB L3
» Intel Coffee Lake i5-8500T
   2.1 GHz / 1.5 MB L2 + 9 MB L3
» Intel Coffee Lake i5-9400H
   2.5 GHz / 1 MB L2 + 8 MB L3
» Intel Coffee Lake i5-9300HF
   2.4 GHz / 1 MB L2 + 8 MB L3
» Intel Coffee Lake i5-9300H
   2.4 GHz / 1 MB L2 + 8 MB L3
» Intel Coffee Lake i5-8400H
   2.5 GHz / 1 MB L2 + 8 MB L3
» Intel Coffee Lake i7-8559U
   2.7 GHz / 1 MB L2 + 8 MB L3
» Intel Coffee Lake i5-8300H
   2.3 GHz / 1 MB L2 + 8 MB L3
» Intel Coffee Lake i5-9400F
   2.9 GHz / 1.5 MB L2 + 9 MB L3
» Intel Coffee Lake i3-9100F
   3.6 GHz / 1 MB L2 + 6 MB L3
» Intel Coffee Lake i7-8557U
   1.7 GHz / 1 MB L2 + 8 MB L3
» Intel Coffee Lake i5-8269U
   2.6 GHz / 1 MB L2 + 6 MB L3
» Intel Coffee Lake i5-8279U
   2.4 GHz / 1 MB L2 + 6 MB L3
» Intel Coffee Lake i5-8259U
   2.3 GHz / 1 MB L2 + 6 MB L3
» Intel Coffee Lake i5-8257U
   1.4 GHz / 1 MB L2 + 6 MB L3
» Intel Coffee Lake i3-8100H
   3 GHz / 1 MB L2 + 8 MB L3
» Intel Coffee Lake i3-8109U
   3 GHz / 0.5 MB L2 + 4 MB L3

Surrounding CPUs

- Intel Ice Lake i7-1165G7
   2.8 GHz
- Intel Ice Lake i7-1065G7
   1.3 GHz / 2 MB + 8 MB
- AMD Picasso (Ryzen 3000 APU) R7 3780U
   2.3 GHz / 2 MB + 4 MB
- AMD Ryzen 5 R5 1400
   3.2 GHz / 2 MB + 8 MB
- Intel Coffee Lake i5-8259U
   2.3 GHz / 1 MB + 6 MB
» Intel Coffee Lake i5-8257U
   1.4 GHz / 1 MB L2 + 6 MB L3
+ Intel Core i7 4900MQ
   2.8 GHz / 1024 KB + 8192 KB
+ Intel Comet Lake i7-10610U
   1.8 GHz / 1024 KB + 8192 KB
+ Intel Comet Lake i7-10510U
   1.8 GHz / 1024 KB + 8192 KB
+ Intel Core i7 4960HQ
   2.6 GHz / 1024 KB + 6144 KB
+ Intel Core i7 6700HQ
   2.6 GHz / 1024 KB + 6144 KB
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Klaus Hinum (Update: 2019-07-16)