IntelBX80662I76700K
IntelBX80684I58400

4 Cores, 8 Threads
@4.0GHz Skylake (2015)

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

Real World Speed
Performance profile from 173,128 user samples
170,341 User Benchmarks
Best Bench: 106% Base clock 4 GHz, turbo 4.6 GHz (avg)
Worst Bench: 80% Base clock 4 GHz, turbo 0.65 GHz (avg)
Poor: 80% Great: 106%
SPEED RANK: 23rd / 981
Gaming
Gaming 93%
Nuclear submarine
Desktop
Desktop 93%
Nuclear submarine
Workstation
Workstation 68%
Battle cruiser
2,787 User Benchmarks
Best Bench: 96% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Worst Bench: 86% Base clock 2.8 GHz, turbo 1.1 GHz (avg)
Poor: 86% Great: 96%
SPEED RANK: 24th / 981
Gaming
Gaming 92%
Nuclear submarine
Desktop
Desktop 89%
Aircraft carrier
Workstation
Workstation 68%
Battle cruiser
Effective Speed
Effective CPU Speed
92.6 % +0% 92.3 % -0%
SC Mixed
Avg. Single Core Mixed Speed
130 Pts Slightly faster single-core speed.
+8%
120 Pts -8%
QC Mixed
Avg. Quad Core Mixed Speed
454 Pts -3% 469 Pts +3%
MC Mixed
Avg. Multi Core Mixed Speed
688 Pts 0% 688 Pts 0%
SC Mixed
OC Single Core Mixed Speed
144 Pts Slightly faster OC single-core speed.
+14%
126 Pts -14%
QC Mixed
OC Quad Core Mixed Speed
536 Pts Slightly faster OC quad-core speed.
+10%
489 Pts -10%
MC Mixed
OC Multi Core Mixed Speed
777 Pts Slightly faster OC multi-core speed.
+7%
725 Pts -7%
Market Share
Based on 6,894,829 CPUs tested.
Market Share
Market Share (trailing 30 days)
2.11 % Hugely higher market share.
+246%
0.61 % -246%
Value
Value For Money
91.6 % -16% 106 % Better value.
+16%
User Rating
UBM User Rating
109 % Much more popular.
+60%
68 % -60%
Price
Price (score)
$300 -33% $200 Much cheaper.
+33%
Age
Newest
29 Months -90% 3 Months Hugely more recent.
+90%
TDP
Thermal Design Power (TDP)
91 Watts -29% 65 Watts More energy efficient.
+29%
Cores
CPU Processing Cores
4 cores -50% 6 cores Much higher core count.
+50%
Threads
CPU Processing Threads
8 threads Much higher thread count.
+33%
6 threads -33%
Lithography
Manufacturing process
14 nm 0% 14 nm 0%
Base Clock
Base Clock Speed
4 GHz Much faster base frequency.
+43%
2.8 GHz -43%
Turbo Clock
Turbo Clock Speed
4.2 GHz +5% 4 GHz -5%
SC Int
Single Core Integer Speed
142 Pts Faster single-core int speed.
+16%
122 Pts -16%
SC Float
Single Core Floating Point Speed
147 Pts Slightly faster single-core fp speed.
+14%
129 Pts -14%
QC Int
Quad Core Integer Speed
523 Pts Slightly faster quad-core int speed.
+10%
476 Pts -10%
QC Float
Quad Core Floating Point Speed
551 Pts Slightly faster quad-core fp speed.
+9%
504 Pts -9%
MC Int
Multi Core Integer Speed
718 Pts +2% 707 Pts -2%
MC Float
Multi Core Floating Point Speed
816 Pts Slightly faster multi-core fp speed.
+9%
747 Pts -9%
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
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) January 2018 CPU Rankings.

Welcome to our desktop CPU comparison. We calculate effective speed which measures real world performance for typical consumers. Effective speed is adjusted by price to yield a value for money rating which is geared towards gamers. Calculated values don't always paint the whole picture so we check them against hundreds of individual user ratings. The customizable table below combines these factors and more to bring you the definitive list of top CPUs. [CPUPro]

How Fast Is Your CPU? (Bench your build) Size up your PC in less than a minute.

Welcome to our freeware PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best upgrades.

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  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on userbenchmark.com.
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
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CPUGPUSSD
Intel Core i7-7700K $280Nvidia GTX 1070 $430Samsung 850 Evo 250GB $90
AMD Ryzen 7 1700 $290Nvidia GTX 1060-6GB $275Samsung 850 Evo 500GB $140
Intel Core i5-7600K $210AMD RX 480 $400Samsung 850 Pro 256GB $110
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $205SanDisk Extreme 64GB $65
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $931SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $51Corsair Vengeance LPX DDR4 3200 C16 2x8GB $220SanDisk Ultra Fit 32GB $12
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