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Intel Core i3-8109U

The Intel Core i3-8109U is a dual-core SoC for notebooks based on the Coffee Lake architecture and was announced in April 2018. Compared to its predecessor Core i3-7167U, the CPU now supports Turbo boost with up to 3.6 GHz. Thanks to Hyperthreading the CPU can execute up to 4 threads simultaneously. It is also equipped with an Intel Iris Plus Graphics 655 GPU with 128 MB eDRAM (but with 300 - 1050 MHz it is the slowest Iris Plus), 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 (3rd generation) with FinFET transistors.


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.


Thanks to the Turbo Boost, the processor performance should be a bit above the old Core i7-7500U (max. 3.5 GHz, 15 Watt). Therefore the Core i3-8109U should be fine for most applications. Some games however already need four real cores for optimal performance (paired with a dedicated GPU e.g.).


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  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 (14nm++, 3rd generation of 14nm) 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.

SeriesIntel Coffee Lake
CodenameCoffee Lake-U

Series: Coffee Lake Coffee Lake-U

Intel Core i7-8559U compare2.7 - 4.5 GHz4 / 8 cores8 MB L3
Intel Core i7-8557U compare1.7 - 4.5 GHz4 / 8 cores8 MB L3
Intel Core i5-8269U compare2.6 - 4.2 GHz4 / 8 cores6 MB L3
Intel Core i5-8279U compare2.4 - 4.1 GHz4 / 8 cores6 MB L3
Intel Core i5-8259U compare2.3 - 3.8 GHz4 / 8 cores6 MB L3
Intel Core i5-8257U compare1.4 - 3.9 GHz4 / 8 cores6 MB L3
Intel Core i3-8109U « 3 - 3.6 GHz2 / 4 cores4 MB L3
Clock Rate3000 - 3600 MHz
Level 1 Cache128 KB
Level 2 Cache512 KB
Level 3 Cache4 MB
Number of Cores / Threads2 / 4
Power Consumption (TDP = Thermal Design Power)28 Watt
Manufacturing Technology14 nm
Max. Temperature100 °C
FeaturesDual-Channel DDR4 Memory Controller, HyperThreading, AVX, AVX2, Quick Sync, Virtualization, AES-NI, Intel SSE4.1, Intel SSE 4.2
GPUIntel Iris Plus Graphics 655 (300 - 1050 MHz)
64 Bit64 Bit support
Announcement Date04/03/2018
Product Link (external)


Performance Rating - CB R15 + R20 + 7-Zip + X265 + Blender + 3DM11 CPU
25.1 pt (35%)
Cinebench R15 - Cinebench R15 CPU Multi 64 Bit
min: 324     avg: 352.5     median: 352.5 (2%)     max: 381 Points
Cinebench R15 - Cinebench R15 CPU Single 64 Bit
min: 124.3     avg: 138.7     median: 138.7 (42%)     max: 153 Points
3DMark - 3DMark Time Spy CPU
min: 1932     avg: 2134     median: 2134 (9%)     max: 2336 Points
Power Consumption - Prime95 Power Consumption - external Monitor *
35.9 Watt (6%)
Power Consumption - Cinebench R15 Multi Power Consumption - external Monitor *
32.4 Watt (6%)
Power Consumption - Cinebench R15 Multi Power Efficiency - external Monitor
10 Points per Watt (7%)
- 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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