IntelBX80662I56600K
IntelBX80684I58400

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

6 Cores, 6 Threads @2.8GHz, Coffee Lake.
Release date: Q4 2017.

Real World Speed
Performance profile from 146,864 user samples
119,652 User Benchmarks
Best Bench: 103% Base clock 3.5 GHz, turbo 4.6 GHz (avg)
Worst Bench: 65% Base clock 3.5 GHz, turbo 0.85 GHz (avg)
Poor: 65% Great: 103%
SPEED RANK: 44th / 1122
Gaming
Gaming 85%
Aircraft carrier
Desktop
Desktop 83%
Aircraft carrier
Workstation
Workstation 52%
Yacht
27,212 User Benchmarks
Best Bench: 94% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Worst Bench: 80% Base clock 2.8 GHz, turbo 0.75 GHz (avg)
Poor: 80% Great: 94%
SPEED RANK: 32nd / 1122
Gaming
Gaming 89%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 65%
Destroyer
Effective Speed
Effective CPU Speed
85.4 % 89.4 % +5%
SC Mixed
Avg. Single Core Mixed Speed
118 Pts +1% 117 Pts
QC Mixed
Avg. Quad Core Mixed Speed
442 Pts 454 Pts +3%
MC Mixed
Avg. Multi Core Mixed Speed
452 Pts 657 Pts Much faster multi-core speed.
+45%
SC Mixed
OC Single Core Mixed Speed
142 Pts Faster OC single-core speed.
+15%
123 Pts
QC Mixed
OC Quad Core Mixed Speed
545 Pts Slightly faster OC quad-core speed.
+14%
477 Pts
MC Mixed
OC Multi Core Mixed Speed
551 Pts 703 Pts Faster OC multi-core speed.
+28%
Market Share
Based on 10,334,635 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.25 % 1.54 % Higher market share.
+23%
Value
Value For Money
98.3 % 107 % Slightly better value.
+9%
User Rating
UBM User Rating
71 % 113 % Much more popular.
+59%
Price
Price (score)
$200 $180 Slightly cheaper.
+10%
Age
Newest
36 Months 10 Months Much more recent.
+72%
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
137 Pts Faster single-core int speed.
+16%
118 Pts
SC Float
Single Core Floating Point Speed
148 Pts Faster single-core fp speed.
+16%
128 Pts
QC Int
Quad Core Integer Speed
525 Pts Slightly faster quad-core int speed.
+14%
462 Pts
QC Float
Quad Core Floating Point Speed
578 Pts Faster quad-core fp speed.
+16%
499 Pts
MC Int
Multi Core Integer Speed
529 Pts 678 Pts Faster multi-core int speed.
+28%
MC Float
Multi Core Floating Point Speed
577 Pts 739 Pts Faster multi-core fp speed.
+28%
Series
CPU Architecture
Skylake Coffee Lake
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]

MORE DETAILS

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]

MORE DETAILS

Processor Rankings (Price vs Performance) August 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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CPUGPUSSD
Intel Core i7-8700K $330Nvidia GTX 1070 $370Samsung 850 Evo 250GB $95
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HDDRAMUSB
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