IntelBX80662I56600K
IntelBX80684I58400

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

6 Cores, 6 Threads
@2.8GHz Coffee Lake (2017)

Real World Speed
Performance profile from 140,677 user samples
124,806 User Benchmarks
Best Bench: 106% Base clock 3.5 GHz, turbo 4.8 GHz (avg)
Worst Bench: 67% Base clock 3.5 GHz, turbo 0.75 GHz (avg)
Poor: 67% Great: 106%
SPEED RANK: 40th / 1110
Gaming
Gaming 88%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 53%
Yacht
15,871 User Benchmarks
Best Bench: 95% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Worst Bench: 83% Base clock 2.8 GHz, turbo 1.4 GHz (avg)
Poor: 83% Great: 95%
SPEED RANK: 31st / 1110
Gaming
Gaming 92%
Nuclear submarine
Desktop
Desktop 88%
Aircraft carrier
Workstation
Workstation 67%
Battle cruiser
Effective Speed
Effective CPU Speed
87.8 % 91.4 % +4%
SC Mixed
Avg. Single Core Mixed Speed
121 Pts +2% 119 Pts
QC Mixed
Avg. Quad Core Mixed Speed
455 Pts 465 Pts +2%
MC Mixed
Avg. Multi Core Mixed Speed
467 Pts 677 Pts Much faster multi-core speed.
+45%
SC Mixed
OC Single Core Mixed Speed
144 Pts Faster OC single-core speed.
+15%
125 Pts
QC Mixed
OC Quad Core Mixed Speed
558 Pts Slightly faster OC quad-core speed.
+15%
486 Pts
MC Mixed
OC Multi Core Mixed Speed
562 Pts 720 Pts Faster OC multi-core speed.
+28%
Market Share
Based on 9,296,913 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.32 % Much higher market share.
+31%
1.01 %
Value
Value For Money
97.1 % 110 % Slightly better value.
+13%
User Rating
UBM User Rating
67 % 103 % Much more popular.
+54%
Price
Price (score)
$223 $179 Cheaper.
+20%
Age
Newest
34 Months 8 Months Much more recent.
+76%
TDP
Thermal Design Power (TDP)
91 Watts 65 Watts More energy efficient.
+29%
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 Faster base frequency.
+25%
2.8 GHz
Turbo Clock
Turbo Clock Speed
3.9 GHz 4 GHz +3%
SC Int
Single Core Integer Speed
140 Pts Slightly faster single-core int speed.
+15%
122 Pts
SC Float
Single Core Floating Point Speed
149 Pts Faster single-core fp speed.
+16%
128 Pts
QC Int
Quad Core Integer Speed
542 Pts Slightly faster quad-core int speed.
+15%
473 Pts
QC Float
Quad Core Floating Point Speed
583 Pts Faster quad-core fp speed.
+16%
501 Pts
MC Int
Multi Core Integer Speed
543 Pts 699 Pts Faster multi-core int speed.
+29%
MC Float
Multi Core Floating Point Speed
586 Pts 742 Pts Faster multi-core fp speed.
+27%
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 (65W)
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
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.15 GHz 1.05 GHz
TSX-NI
Intel® TSX-NI
Yes No
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 i5-8400 is a competitively priced hex-core processor from Intel’s 8th generation of Core processors (Coffee Lake). Along with the release of the unlocked i5-8600K, this is the first time that six-core processors have featured in the i5 line-up. Like the other Coffee Lake processors, the i5-8400 is based upon an improved version of Intel’s 14nm architecture which featured in both Skylake and Kaby Lake. Early benchmarks reveal that for average quad core usage (most games employ a maximum of four cores) the i5-8400 performs way above its pay grade. It achieves quad core mixed speeds close to Intel’s outgoing 2017 flagship the $300, quad-core, 8 thread i7-7700k, which to date has been a strong favourite for high-end gaming setups. On paper, the i5-8400 has a base clock of 2.8 GHz (Intel are significantly downplaying the performance of this SKU by giving it a relatively low nominal base clock), an all core boost of 3.8 GHz (this is the effective base clock figure that counts) and a single core boost of 4 GHz. This compares reasonably well to the i5-8600K which has a base clock of 3.6 GHz, all core boost of 4.1 GHz and a single core boost of 4.3 GHz. The i5-8400 also features 9MB of L3 cache and an energy-thrifty TDP of 65W. Priced at under $190, the i5-8400 offers fantastic value for money. Unfortunately, like the other Coffee Lake processors, the i5-8400 will require a new 300 series motherboard, and at the time of writing, the only available version is Intel’s high-end Z370 which isn't an ideal pairing for the i5-8400. The Z series motherboards are designed to cater for the unlocked and overclockable "K" SKUs. Cheaper 300 series motherboards will be available in 2018 at which time the 8400 will offer even better value for money. [Oct '17 CPUPro]

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Processor Rankings (Price vs Performance) June 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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CPUGPUSSD
AMD Ryzen 5 1600 $175Nvidia GTX 1070 $447Samsung 850 Evo 250GB $104
Intel Core i7-8700K $340Nvidia GTX 1060-6GB $250Samsung 850 Evo 500GB $117
Intel Core i5-8600K $239AMD RX 480 $280Samsung 850 Pro 256GB $116
HDDRAMUSB
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $177SanDisk Extreme 64GB $44
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $951SanDisk Extreme 32GB $30
Seagate Barracuda 2TB (2016) $31HyperX Fury DDR4 2133 C14 2x8GB $226SanDisk Ultra Fit 32GB $12
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