IntelBX80662I76700K
IntelBX80684I78700K

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

6 Cores, 12 Threads @3.7GHz, Coffee Lake.
Release date: Q4 2017.

Real World Speed
Performance profile from 543,334 user samples
286,508 User Benchmarks
Best Bench: 103% Base clock 4 GHz, turbo 4.8 GHz (avg)
Worst Bench: 75% Base clock 4 GHz, turbo 0.8 GHz (avg)
Poor: 75% Great: 103%
SPEED RANK: 46th / 1147
Gaming
Gaming 89%
Aircraft carrier
Desktop
Desktop 90%
Nuclear submarine
Workstation
Workstation 65%
Battle cruiser
256,826 User Benchmarks
Best Bench: 124% Base clock 3.7 GHz, turbo 5.3 GHz (avg)
Worst Bench: 92% Base clock 3.7 GHz, turbo 1.45 GHz (avg)
Poor: 92% Great: 124%
SPEED RANK: 21st / 1147
Gaming
Gaming 107%
UFO
Desktop
Desktop 105%
UFO
Workstation
Workstation 94%
Nuclear submarine
Effective Speed
Effective CPU Speed
89.1 % 107 % Faster effective speed.
+20%
SC Mixed
Avg. Single Core Mixed Speed
127 Pts 137 Pts Slightly faster single-core speed.
+8%
QC Mixed
Avg. Quad Core Mixed Speed
435 Pts 520 Pts Faster quad-core speed.
+20%
MC Mixed
Avg. Multi Core Mixed Speed
658 Pts 1063 Pts Much faster multi-core speed.
+62%
SC Mixed
OC Single Core Mixed Speed
142 Pts 154 Pts Slightly faster OC single-core speed.
+8%
QC Mixed
OC Quad Core Mixed Speed
520 Pts 612 Pts Faster OC quad-core speed.
+18%
MC Mixed
OC Multi Core Mixed Speed
753 Pts 1223 Pts Much faster OC multi-core speed.
+62%
Market Share
Based on 15,638,735 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.59 % 2.77 % Much higher market share.
+74%
Value
Value For Money
88 % 98 % Slightly better value.
+11%
User Rating
UBM User Rating
83 % 162 % Hugely more popular.
+95%
Price
Price (score)
$302 Cheaper.
+18%
$370
Age
Newest
43 Months 17 Months Much more recent.
+60%
TDP
Thermal Design Power (TDP)
91 Watts +4% 95 Watts
Cores
CPU Processing Cores
4 cores 6 cores Much higher core count.
+50%
Threads
CPU Processing Threads
8 threads 12 threads Much higher thread count.
+50%
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
4 GHz Slightly faster base frequency.
+8%
3.7 GHz
Turbo Clock
Turbo Clock Speed
4.2 GHz 4.7 GHz Slightly faster turbo frequency.
+12%
SC Int
Single Core Integer Speed
139 Pts 150 Pts Slightly faster single-core int speed.
+8%
SC Float
Single Core Floating Point Speed
147 Pts 159 Pts Slightly faster single-core fp speed.
+8%
QC Int
Quad Core Integer Speed
505 Pts 595 Pts Faster quad-core int speed.
+18%
QC Float
Quad Core Floating Point Speed
542 Pts 632 Pts Faster quad-core fp speed.
+17%
MC Int
Multi Core Integer Speed
683 Pts 1110 Pts Much faster multi-core int speed.
+63%
MC Float
Multi Core Floating Point Speed
804 Pts 1313 Pts Much faster multi-core fp speed.
+63%
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 12 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 (130W)
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 1.20 GHz
vPro Tech
Intel® vPro™ Technology ‡
No Yes
Stable Image Platform Program (SIPP)
Intel® Stable Image Platform Program (SIPP)
No Yes
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
No Yes
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 i7-8700K is Intel’s latest, top of the range, 8th generation Coffee Lake processor. Like Kaby Lake and Sky Lake before that, Coffee Lake is based on Intel’s 14nm architecture which has been slightly optimized on each iteration. Following AMD’s modus operandi, Intel has upped the cores and threads across the range of their CPUs. In previous generations, a 6-core processor would have been a high-end desk-top (HEDT) processor, however the i7-8700K is the first Intel CPU with 6 cores and 12 threads to be classified (and priced) as a mainstream consumer processor. Specifically, the i7-8700K features a base clock speed of 3.7 GHz which boosts to 4.7 GHz (4.5 GHz for the previous generation i7-7700k), 12MB of smart (L3) cache and 2 channels of DDR4 RAM. The majority of the performance improvements over the 7th generation stem from the higher core count which results in a 50% increase in multi-core speed between the i7-7700k and i7-8700k. A new motherboard will need to be factored into the budget when upgrading to the 8700K as it requires a new Intel Z370 chipset which has supposedly been designed to better deliver power to CPUs with a greater number of cores. Also available in this latest release of CPUs is the 6 core 6 thread i5-8600k which is a more rational option (around $100 cheaper) for the vast majority of users that don’t require hyper-threading. Sandy bridge owners can finally justify an upgrade but with the next iteration of AMD's Zen architecture just around the corner the CPU market will be a lot faster moving now that Intel, once again, has to compete. [Sep '17 CPUPro]

MORE DETAILS

Processor Rankings (Price vs Performance) March 2019 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 $364Samsung 850 Evo 250GB $75
AMD Ryzen 5 1600 $120Nvidia GTX 1060-6GB $230Samsung 850 Evo 500GB $105
Intel Core i5-8600K $260Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $97
HDDRAMUSB
Seagate Barracuda 1TB (2016) $43Corsair Vengeance LPX DDR4 3000 C15 2x8GB $105SanDisk Extreme 64GB $43
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $761SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $110SanDisk Ultra Fit 32GB $12
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