6 Cores, 6 Threads
@3.6GHz Coffee Lake (2017)

Real World Speed
Performance profile from 140,390 user samples
15,940 User Benchmarks
Best Bench: 120% Base clock 3.6 GHz, turbo 5.4 GHz (avg)
Worst Bench: 95% Base clock 3.6 GHz, turbo 0.8 GHz (avg)
Poor: 95% Great: 120%
SPEED RANK: 9th / 1052
Gaming 105%
Desktop 101%
Workstation 76%
124,450 User Benchmarks
Best Bench: 101% Base clock 4 GHz, turbo 4.7 GHz (avg)
Worst Bench: 76% Base clock 4 GHz, turbo 0.3 GHz (avg)
Poor: 76% Great: 101%
SPEED RANK: 32nd / 1052
Gaming 89%
Aircraft carrier
Desktop 89%
Aircraft carrier
Workstation 65%
Effective Speed
Effective CPU Speed
105 % Faster effective speed.
88.7 %
SC Mixed
Avg. Single Core Mixed Speed
136 Pts Slightly faster single-core speed.
125 Pts
QC Mixed
Avg. Quad Core Mixed Speed
534 Pts Faster quad-core speed.
435 Pts
MC Mixed
Avg. Multi Core Mixed Speed
777 Pts Faster multi-core speed.
647 Pts
SC Mixed
OC Single Core Mixed Speed
156 Pts Slightly faster OC single-core speed.
138 Pts
QC Mixed
OC Quad Core Mixed Speed
615 Pts Faster OC quad-core speed.
511 Pts
MC Mixed
OC Multi Core Mixed Speed
895 Pts Faster OC multi-core speed.
721 Pts
Market Share
Based on 7,873,973 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.19 % 1.48 % Higher market share.
Value For Money
114 % Much better value.
84.7 %
User Rating
UBM User Rating
115 % Slightly more popular.
101 %
Price (score)
$235 Cheaper.
5 Months Hugely more recent.
45 Months
Thermal Design Power (TDP)
95 Watts 88 Watts Slightly more energy efficient.
CPU Processing Cores
6 cores Much higher core count.
4 cores
CPU Processing Threads
6 threads 8 threads Much higher thread count.
Manufacturing process
14 nm Much newer manufacturing.
22 nm
Base Clock
Base Clock Speed
3.6 GHz 4 GHz Slightly faster base frequency.
Turbo Clock
Turbo Clock Speed
4.3 GHz 4.4 GHz +2%
SC Int
Single Core Integer Speed
151 Pts Slightly faster single-core int speed.
138 Pts
SC Float
Single Core Floating Point Speed
162 Pts Faster single-core fp speed.
138 Pts
QC Int
Quad Core Integer Speed
590 Pts Faster quad-core int speed.
507 Pts
QC Float
Quad Core Floating Point Speed
645 Pts Faster quad-core fp speed.
514 Pts
MC Int
Multi Core Integer Speed
868 Pts Faster multi-core int speed.
685 Pts
MC Float
Multi Core Floating Point Speed
946 Pts Faster multi-core fp speed.
732 Pts
CPU Architecture
Coffee Lake (2017) Haswell (2013)
Motherboard Socket
Integrated Graphics
UHD 630 HD 4600
Launch Date
Launch Date
Q4'17 Q2'14
9 MB 8 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2 SSE4.1/4.2, AVX 2.0
14 nm 22 nm
Recommended Price
Recommended Customer Price
N/A $339.00 - $350.00
Bus Speed
Bus Speed
8 GT/s DMI3 5 GT/s DMI2
Thermal Solution Specification
Thermal Solution Specification
PCG 2015C (130W) PCG 2013D
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 32 GB
Memory Types
Memory Types
DDR4-2666 DDR3-1333/1600, DDR3L-1333/1600 @ 1.5V
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 Intel® HD Graphics 4600
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.15 GHz 1.25 GHz
Graphics Video Max Memory
Graphics Video Max Memory
64 GB 2 GB
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
No Yes
Intel® TSX-NI
Yes No
vPro Tech
Intel® vPro™ Technology ‡
Yes No
Stable Image Platform Program (SIPP)
Intel® Stable Image Platform Program (SIPP)
Yes No
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
Yes No
PCI Express Configurations
PCI Express Configurations ‡
Up to 1x16 or 2x8 or 1x8+2x4 Up to 1x16, 2x8, 1x8+2x4

More specs » More specs »

The unlocked hex-core i5-8600K from Intel’s latest Coffee Lake generation of processors is the new flagship of the i5 series, succeeding the Kaby Lake quad-core i5-7600K. The 8th generation of processors brings the largest performance uplift since Sandy Bridge by adding more cores at each of the i3, i5 and i7 product lines. Like the other Coffee Lake processors, the i5-8600K is built upon optimized 14nm architecture, marginally improved upon from Kaby Lake and Skylake. The 8600K has a 95W TDP and a nominal stock clock of 3.6 GHz, which boosts to 4.1 GHz for all six cores, 4.2 GHz for dual/quad and 4.3 GHz for single core. Early benchmarks put the i5-8600K’s effective speed 15% ahead of the i5-7600K. A 50% increase in multi-core speed is explained by two additional cores and thanks to the quad-core clock bump from 4 GHz on the 7600K to 4.2 GHz on the 8600K there is also an additional 5% performance boost across all workloads. All Coffee Lake processors require a 300-series chipset, making a straight CPU upgrade unfeasible despite sharing the same socket as their Z270 predecessors. Even though most games still use less than 4 cores simultaneously, the i5-8600K is a great choice for gamers (especially streamers) but for $80 less, the 8350K which is faster than last years 7600K and only marginally weaker for gaming than the 8600K is certainly well worth considering as well. [Oct '17 CPUPro]


The Intel Core i7-4790K, codenamed Devil's Canyon, is an upgraded 4770K, Intel's current flagship i7. The 4790K features an improved thermal interface which enables it to dissipate heat more efficiently than the 4770K. Comparing the 4770K and 4790K shows that stock performance has improved by 13% which is consistent with the base clock jump from 3.5 GHz to 4.0 GHz. OC performance remains unchanged. Comparing the 4790K and 4790 shows that at stock clocks the 4790K is around 16% faster which considering the small price difference makes the 4790K a far better choice. Previously Intel targeted the unlocked K versions at overclockers but with Devil's Canyon they have included VT-d on the K chip and this time it's squarely aimed at both power users and overclockers alike. Until the release of Broadwell in six months, the 4790K is the high end CPU of choice. [Jul '14 CPUPro]


Processor Rankings (Price vs Performance) March 2018 CPU Rankings.

We calculate effective speed which measures real world performance for typical consumers. Effective speed is adjusted by current prices to yield a value for money rating which is geared towards gamers. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top CPUs. [CPUPro]


Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
  • Best value for money - Value for money is based on real world performance and price.
How Fast Is Your CPU? (Bench your build) Size up your PC in less than a minute.

Welcome to our freeware PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best upgrades.

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  • - CPU tests include: integer, floating and string.
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  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on
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  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
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AMD Ryzen 5 1600 $189AMD RX 480 $400Samsung 850 Pro 256GB $140
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Seagate Barracuda 7200.14 1TB $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $205SanDisk Extreme 16GB $18
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