IntelBX80684I58600K
IntelBX80662I56600K

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

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

Real World Speed
Performance profile from 126,667 user samples
20,512 User Benchmarks
Best Bench: 122% Base clock 3.6 GHz, turbo 5.4 GHz (avg)
Worst Bench: 91% Base clock 3.6 GHz, turbo 1.2 GHz (avg)
Poor: 91% Great: 122%
SPEED RANK: 10th / 1100
Gaming
Gaming 103%
UFO
Desktop
Desktop 100%
Nuclear submarine
Workstation
Workstation 75%
Battleship
106,155 User Benchmarks
Best Bench: 107% Base clock 3.5 GHz, turbo 4.8 GHz (avg)
Worst Bench: 68% Base clock 3.5 GHz, turbo 0.75 GHz (avg)
Poor: 68% Great: 107%
SPEED RANK: 39th / 1100
Gaming
Gaming 89%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 54%
Yacht
Effective Speed
Effective CPU Speed
103 % Faster effective speed.
+17%
88.7 %
SC Mixed
Avg. Single Core Mixed Speed
135 Pts Slightly faster single-core speed.
+11%
122 Pts
QC Mixed
Avg. Quad Core Mixed Speed
526 Pts Slightly faster quad-core speed.
+14%
460 Pts
MC Mixed
Avg. Multi Core Mixed Speed
766 Pts Much faster multi-core speed.
+63%
471 Pts
SC Mixed
OC Single Core Mixed Speed
158 Pts Slightly faster OC single-core speed.
+9%
145 Pts
QC Mixed
OC Quad Core Mixed Speed
622 Pts Slightly faster OC quad-core speed.
+11%
561 Pts
MC Mixed
OC Multi Core Mixed Speed
905 Pts Much faster OC multi-core speed.
+60%
567 Pts
Market Share
Based on 8,488,958 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.37 % Higher market share.
+21%
1.13 %
Value
Value For Money
112 % Slightly better value.
+13%
98.3 %
User Rating
UBM User Rating
132 % Much more popular.
+52%
87 %
Price
Price (score)
$239 $222 Slightly cheaper.
+7%
Age
Newest
6 Months Hugely more recent.
+81%
32 Months
TDP
Thermal Design Power (TDP)
95 Watts 91 Watts +4%
Cores
CPU Processing Cores
6 cores Much higher core count.
+50%
4 cores
Threads
CPU Processing Threads
6 threads Much higher thread count.
+50%
4 threads
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
3.6 GHz +3% 3.5 GHz
Turbo Clock
Turbo Clock Speed
4.3 GHz Slightly faster turbo frequency.
+10%
3.9 GHz
SC Int
Single Core Integer Speed
154 Pts Slightly faster single-core int speed.
+9%
141 Pts
SC Float
Single Core Floating Point Speed
163 Pts Slightly faster single-core fp speed.
+9%
149 Pts
QC Int
Quad Core Integer Speed
598 Pts Slightly faster quad-core int speed.
+9%
549 Pts
QC Float
Quad Core Floating Point Speed
649 Pts Slightly faster quad-core fp speed.
+11%
587 Pts
MC Int
Multi Core Integer Speed
873 Pts Much faster multi-core int speed.
+59%
550 Pts
MC Float
Multi Core Floating Point Speed
960 Pts Much faster multi-core fp speed.
+63%
590 Pts
Series
CPU Architecture
Coffee Lake (2017) Skylake (2015)
Socket
Motherboard Socket
FCLGA1151 FCLGA1151
Graphics
Integrated Graphics
UHD 630 HD 530
Launch Date
Launch Date
Q4'17 Q3'15
Cache
Cache
9 MB 6 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2 SSE4.1/4.2, AVX 2.0
Recommended Price
Recommended Customer Price
N/A $242.00 - $243.00
Thermal Solution Specification
Thermal Solution Specification
PCG 2015C (130W) PCG 2015D (130W)
Memory Types
Memory Types
DDR4-2666 DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 Intel® HD Graphics 530
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 »
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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]

MORE DETAILS

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]

MORE DETAILS

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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