IntelBX80662I56600K
IntelBX80646I74790K

4 Cores, 4 Threads @3.5GHz, Skylake.
Release date: Q3 2015.

4 Cores, 8 Threads @4.0GHz, Haswell.
Release date: Q2 2014.

Real World Speed
Performance profile from 286,600 user samples
129,791 User Benchmarks
Best Bench: 105% Base clock 3.5 GHz, turbo 5 GHz (avg)
Worst Bench: 68% Base clock 3.5 GHz, turbo 0.75 GHz (avg)
Poor: 68% Great: 105%
SPEED RANK: 43rd / 1129
Gaming
Gaming 86%
Aircraft carrier
Desktop
Desktop 84%
Aircraft carrier
Workstation
Workstation 52%
Yacht
156,809 User Benchmarks
Best Bench: 99% Base clock 4 GHz, turbo 4.8 GHz (avg)
Worst Bench: 69% Base clock 4 GHz, turbo 0.8 GHz (avg)
Poor: 69% Great: 99%
SPEED RANK: 45th / 1129
Gaming
Gaming 85%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 63%
Destroyer
Effective Speed
Effective CPU Speed
86 % +1% 85.1 %
SC Mixed
Avg. Single Core Mixed Speed
119 Pts 121 Pts +2%
QC Mixed
Avg. Quad Core Mixed Speed
445 Pts Slightly faster quad-core speed.
+7%
415 Pts
MC Mixed
Avg. Multi Core Mixed Speed
455 Pts 631 Pts Much faster multi-core speed.
+39%
SC Mixed
OC Single Core Mixed Speed
142 Pts Slightly faster OC single-core speed.
+5%
135 Pts
QC Mixed
OC Quad Core Mixed Speed
549 Pts Slightly faster OC quad-core speed.
+9%
503 Pts
MC Mixed
OC Multi Core Mixed Speed
551 Pts 719 Pts Much faster OC multi-core speed.
+30%
Market Share
Based on 11,527,860 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.28 % 1.61 % Higher market share.
+26%
Value
Value For Money
92.8 % Better value.
+19%
78.3 %
User Rating
UBM User Rating
73 % 91 % More popular.
+25%
Price
Price (score)
$238 Much cheaper.
+35%
$365
Age
Newest
38 Months More recent.
+27%
52 Months
TDP
Thermal Design Power (TDP)
91 Watts 88 Watts +3%
Cores
CPU Processing Cores
4 cores 4 cores
Threads
CPU Processing Threads
4 threads 8 threads Hugely higher thread count.
+100%
Lithography
Manufacturing process
14 nm Much newer manufacturing.
+36%
22 nm
Base Clock
Base Clock Speed
3.5 GHz 4 GHz Slightly faster base frequency.
+14%
Turbo Clock
Turbo Clock Speed
3.9 GHz 4.4 GHz Slightly faster turbo frequency.
+13%
SC Int
Single Core Integer Speed
137 Pts +1% 136 Pts
SC Float
Single Core Floating Point Speed
149 Pts Slightly faster single-core fp speed.
+9%
137 Pts
QC Int
Quad Core Integer Speed
522 Pts +3% 508 Pts
QC Float
Quad Core Floating Point Speed
585 Pts Faster quad-core fp speed.
+16%
506 Pts
MC Int
Multi Core Integer Speed
525 Pts 683 Pts Much faster multi-core int speed.
+30%
MC Float
Multi Core Floating Point Speed
586 Pts 732 Pts Faster multi-core fp speed.
+25%
Series
CPU Architecture
Skylake Haswell
Socket
Motherboard Socket
FCLGA1151 FCLGA1150
Graphics
Integrated Graphics
HD 530 HD 4600
Launch Date
Launch Date
Q3'15 Q2'14
Cache
Cache
6 MB SmartCache 8 MB SmartCache
Lithography
Lithography
14 nm 22 nm
Recommended Price
Recommended Customer Price
$242.00 - $243.00 $339.00 - $350.00
Bus Speed
Bus Speed
8 GT/s DMI3 5 GT/s DMI2
Thermal Solution Specification
Thermal Solution Specification
PCG 2015D (130W) PCG 2013D
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 32 GB
Memory Types
Memory Types
DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V DDR3-1333/1600, DDR3L-1333/1600 @ 1.5V
Memory Bandwidth
Max Memory Bandwidth
34.1 GB/s 25.6 GB/s
Processor Graphics
Processor Graphics ‡
Intel® HD Graphics 530 Intel® HD Graphics 4600
Graphics Output
Graphics Output
eDP/DP/HDMI/DVI eDP/DP/HDMI/DVI/VGA
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
Graphics and IMC Lithography
Graphics and IMC Lithography
14 nm 22 nm
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
No Yes
TSX-NI
Intel® TSX-NI
Yes No

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 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]

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Processor Rankings (Price vs Performance) October 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.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
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