IntelBX80662I56600K
IntelBX80684I58600K

4 Cores, 4 Threads
@3.5GHz Skylake (2015)

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

Real World Speed
Performance profile from 133,066 user samples
111,329 User Benchmarks
Best Bench: 107% Base clock 3.5 GHz, turbo 4.8 GHz (avg)
Worst Bench: 70% Base clock 3.5 GHz, turbo 0.75 GHz (avg)
Poor: 70% Great: 107%
SPEED RANK: 38th / 1100
Gaming
Gaming 89%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 54%
Yacht
21,737 User Benchmarks
Best Bench: 122% Base clock 3.6 GHz, turbo 5.3 GHz (avg)
Worst Bench: 92% Base clock 3.6 GHz, turbo 1.15 GHz (avg)
Poor: 92% Great: 122%
SPEED RANK: 11th / 1100
Gaming
Gaming 104%
UFO
Desktop
Desktop 100%
Nuclear submarine
Workstation
Workstation 76%
Battleship
Effective Speed
Effective CPU Speed
89.1 % 104 % Faster effective speed.
+17%
SC Mixed
Avg. Single Core Mixed Speed
122 Pts 135 Pts Slightly faster single-core speed.
+11%
QC Mixed
Avg. Quad Core Mixed Speed
463 Pts 529 Pts Slightly faster quad-core speed.
+14%
MC Mixed
Avg. Multi Core Mixed Speed
473 Pts 769 Pts Much faster multi-core speed.
+63%
SC Mixed
OC Single Core Mixed Speed
145 Pts 158 Pts Slightly faster OC single-core speed.
+9%
QC Mixed
OC Quad Core Mixed Speed
564 Pts 622 Pts Slightly faster OC quad-core speed.
+10%
MC Mixed
OC Multi Core Mixed Speed
567 Pts 893 Pts Much faster OC multi-core speed.
+57%
Market Share
Based on 8,450,868 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.13 % 1.39 % Higher market share.
+23%
Value
Value For Money
98.7 % 112 % Slightly better value.
+13%
User Rating
UBM User Rating
87 % 129 % Much more popular.
+48%
Price
Price (score)
$222 Slightly cheaper.
+7%
$239
Age
Newest
32 Months 6 Months Hugely more recent.
+81%
TDP
Thermal Design Power (TDP)
91 Watts +4% 95 Watts
Cores
CPU Processing Cores
4 cores 6 cores Much higher core count.
+50%
Threads
CPU Processing Threads
4 threads 6 threads Much higher thread count.
+50%
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
3.5 GHz 3.6 GHz +3%
Turbo Clock
Turbo Clock Speed
3.9 GHz 4.3 GHz Slightly faster turbo frequency.
+10%
SC Int
Single Core Integer Speed
141 Pts 153 Pts Slightly faster single-core int speed.
+9%
SC Float
Single Core Floating Point Speed
149 Pts 162 Pts Slightly faster single-core fp speed.
+9%
QC Int
Quad Core Integer Speed
549 Pts 603 Pts Slightly faster quad-core int speed.
+10%
QC Float
Quad Core Floating Point Speed
584 Pts 649 Pts Slightly faster quad-core fp speed.
+11%
MC Int
Multi Core Integer Speed
550 Pts 864 Pts Much faster multi-core int speed.
+57%
MC Float
Multi Core Floating Point Speed
585 Pts 955 Pts Much faster multi-core fp speed.
+63%
Series
CPU Architecture
Skylake (2015) Coffee Lake (2017)
Socket
Motherboard Socket
FCLGA1151 FCLGA1151
Graphics
Integrated Graphics
HD 530 UHD 630
Launch Date
Launch Date
Q3'15 Q4'17
Cache
Cache
6 MB SmartCache 9 MB
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX 2.0 SSE4.1/4.2, AVX2
Recommended Price
Recommended Customer Price
$242.00 - $243.00 N/A
Thermal Solution Specification
Thermal Solution Specification
PCG 2015D (130W) PCG 2015C (130W)
Memory Types
Memory Types
DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V DDR4-2666
Processor Graphics
Processor Graphics ‡
Intel® HD Graphics 530 Intel® UHD Graphics 630
vPro Tech
Intel® vPro™ Technology ‡
No Yes
Stable Image Platform Program (SIPP)
Intel® Stable Image Platform Program (SIPP)
No Yes
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
No Yes
PCI Express Configurations
PCI Express Configurations ‡
Up to 1x16, 2x8, 1x8+2x4 Up to 1x16 or 2x8 or 1x8+2x4

More specs » More specs »
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The Intel Core i5-6600K is based on the new "Skylake" 14nm manufacturing process. Sporting 4 physical cores with base/turbo clocks of 3.5/3.9 GHz the 6600K and its predecessor, the 4690K share the same basic configuration and disappointingly, offer similar performance. Comparing the 6600K and 6700K shows that the 6700K has faster multi and single core performance. The improved multi core performance is due to Hyperthreading which is the key differentiator for the i7-6700K. The gap in single core performance can largely be eliminated by overclocking the i5-6600K so although the stock effective speed is significantly higher on the 6700K, this gap diminishes significantly when both processors are overclocked. At a 30% discount, the 6600K is the better value gaming CPU. [Aug '15 CPUPro]

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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]

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Processor Rankings (Price vs Performance) April 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]

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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.
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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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  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
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  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on userbenchmark.com.
  • - Identify the strongest components in your PC.
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  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
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Intel Core i7-7700K $290Nvidia GTX 1060-6GB $300Samsung 850 Evo 500GB $137
AMD Ryzen 5 1600 $170AMD RX 480 $350Samsung 850 Pro 256GB $163
HDDRAMUSB
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Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $957SanDisk Extreme 32GB $46
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $193SanDisk Ultra Fit 32GB $12
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