IntelBX80662I76700K
IntelBX80684I58400

4 Cores, 8 Threads @4.0GHz, Skylake.
Release date: Q3 2015.

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

Real World Speed
Performance profile from 271,337 user samples
220,456 User Benchmarks
Best Bench: 103% Base clock 4 GHz, turbo 5 GHz (avg)
Worst Bench: 76% Base clock 4 GHz, turbo 0.8 GHz (avg)
Poor: 76% Great: 103%
SPEED RANK: 45th / 1143
Gaming
Gaming 88%
Aircraft carrier
Desktop
Desktop 90%
Aircraft carrier
Workstation
Workstation 66%
Battle cruiser
50,881 User Benchmarks
Best Bench: 94% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 82% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Poor: 82% Great: 94%
SPEED RANK: 42nd / 1143
Gaming
Gaming 89%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 65%
Destroyer
Effective Speed
Effective CPU Speed
88 % 89.3 % +1%
SC Mixed
Avg. Single Core Mixed Speed
126 Pts Slightly faster single-core speed.
+8%
117 Pts
QC Mixed
Avg. Quad Core Mixed Speed
427 Pts 453 Pts Slightly faster quad-core speed.
+6%
MC Mixed
Avg. Multi Core Mixed Speed
666 Pts +2% 653 Pts
SC Mixed
OC Single Core Mixed Speed
142 Pts Faster OC single-core speed.
+15%
123 Pts
QC Mixed
OC Quad Core Mixed Speed
518 Pts Slightly faster OC quad-core speed.
+8%
479 Pts
MC Mixed
OC Multi Core Mixed Speed
765 Pts Slightly faster OC multi-core speed.
+9%
700 Pts
Market Share
Based on 12,835,887 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.88 % Much higher market share.
+55%
1.21 %
Value
Value For Money
87.2 % 99.2 % Slightly better value.
+14%
User Rating
UBM User Rating
86 % 114 % Much more popular.
+33%
Price
Price (score)
$299 $220 Cheaper.
+26%
Age
Newest
40 Months 14 Months Much more recent.
+65%
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
8 threads Much higher thread count.
+33%
6 threads
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
4 GHz Much faster base frequency.
+43%
2.8 GHz
Turbo Clock
Turbo Clock Speed
4.2 GHz +5% 4 GHz
SC Int
Single Core Integer Speed
139 Pts Faster single-core int speed.
+18%
118 Pts
SC Float
Single Core Floating Point Speed
147 Pts Slightly faster single-core fp speed.
+15%
128 Pts
QC Int
Quad Core Integer Speed
506 Pts Slightly faster quad-core int speed.
+10%
461 Pts
QC Float
Quad Core Floating Point Speed
544 Pts Slightly faster quad-core fp speed.
+9%
500 Pts
MC Int
Multi Core Integer Speed
698 Pts +3% 675 Pts
MC Float
Multi Core Floating Point Speed
811 Pts Slightly faster multi-core fp speed.
+10%
739 Pts
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
8 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
$339.00 - $350.00 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
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
Yes No
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 Core i7-6700K is Intel's latest "Skylake" flagship processor. It replaces the hugely successful i7-4790K and takes the crown as the fastest mainstream consumer CPU available. Comparing performance and specs between the 4790K and 6700K shows that the configuration is largely unchanged (same base clocks, cores, threads) but the improved manufacturing process (14nm) brings a small reduction in TDP and a performance improvement of 8%; almost exactly the same jump as between the Ivy Bridge 3770K and Haswell 4770K. Owners of any unlocked-K Intel CPU from Sandy Bridge or onwards still have no real reason to upgrade as the performance improvements are largely academic but the i7-6700K will be the CPU of choice for the vast majority of top end PC builds in 2015. [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) December 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 $370Nvidia GTX 1070 $310Samsung 850 Evo 250GB $63
AMD Ryzen 5 1600 $150Nvidia GTX 1060-6GB $234Samsung 850 Evo 500GB $98
Intel Core i5-8600K $250Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $163
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $125SanDisk Extreme 64GB $43
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $830SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $130SanDisk Ultra Fit 32GB $12
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