IntelBX80662I76700K
IntelBX80684I58400

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

VS
About

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

Real World Speed
Performance profile from 519,632 user samples
381,041 User Benchmarks
Best Bench: 93% Base clock 4 GHz, turbo 4.7 GHz (avg)
Worst Bench: 67% Base clock 4 GHz, turbo 0.8 GHz (avg)
Poor: 67% Great: 93%
SPEED RANK: 62nd / 1206
Gaming
Gaming 80%
Aircraft carrier
Desktop
Desktop 84%
Aircraft carrier
Workstation
Workstation 57%
Gunboat
138,591 User Benchmarks
Best Bench: 84% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 72% Base clock 2.8 GHz, turbo 2.8 GHz (avg)
Poor: 72% Great: 84%
SPEED RANK: 64th / 1206
Gaming
Gaming 80%
Battleship
Desktop
Desktop 80%
Aircraft carrier
Workstation
Workstation 56%
Gunboat
Effective Speed
Effective CPU Speed
80.5 % +1% 79.8 %
1-Core
Avg. Single Core Mixed Speed
126 Pts Slightly faster single-core speed.
+9%
116 Pts
2-Core
Avg. Dual Core Mixed Speed
242 Pts +5% 231 Pts
4-Core
Avg. Quad Core Mixed Speed
429 Pts 450 Pts +5%
8-Core
Avg. Octa Core Mixed Speed
643 Pts +1% 638 Pts
1-Core
OC Single Core Mixed Speed
142 Pts Faster OC single-core speed.
+16%
122 Pts
2-Core
OC Dual Core Mixed Speed
280 Pts Faster OC dual-core speed.
+16%
242 Pts
4-Core
OC Quad Core Mixed Speed
517 Pts Slightly faster OC quad-core speed.
+8%
477 Pts
8-Core
OC Octa Core Mixed Speed
742 Pts Slightly faster OC octa-core speed.
+7%
694 Pts
Market Share
Based on 22,610,001 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.41 % Much higher market share.
+45%
0.97 %
Value
Value For Money
78.9 % 87.3 % Slightly better value.
+11%
User Rating
UBM User Rating
114 % Much more popular.
+48%
77 %
Price
Price (score)
$298 $200 Much cheaper.
+33%
Age
Newest
52 Months 26 Months Much more recent.
+50%
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
64-Core
OC Multi Core Mixed Speed
743 Pts Slightly faster OC 64-core speed.
+6%
699 Pts
64-Core
Avg. Multi Core Mixed Speed
650 Pts +0% 648 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]

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) December 2019 CPU Rankings.

We calculate effective speed which measures real world performance for typical gamers and desktop users. Effective speed is adjusted by current prices to yield a value for money rating. 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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HDDRAMUSB
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