IntelBX80684I78700K
IntelBX80662I56600K

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

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

Real World Speed
Performance profile from 344,214 user samples
197,340 User Benchmarks
Best Bench: 125% Base clock 3.7 GHz, turbo 5.15 GHz (avg)
Worst Bench: 91% Base clock 3.7 GHz, turbo 0.8 GHz (avg)
Poor: 91% Great: 125%
SPEED RANK: 18th / 1143
Gaming
Gaming 108%
UFO
Desktop
Desktop 105%
UFO
Workstation
Workstation 95%
Nuclear submarine
146,874 User Benchmarks
Best Bench: 103% Base clock 3.5 GHz, turbo 4.8 GHz (avg)
Worst Bench: 63% Base clock 3.5 GHz, turbo 1.1 GHz (avg)
Poor: 63% Great: 103%
SPEED RANK: 58th / 1143
Gaming
Gaming 84%
Aircraft carrier
Desktop
Desktop 83%
Aircraft carrier
Workstation
Workstation 51%
Yacht
Effective Speed
Effective CPU Speed
108 % Faster effective speed.
+28%
84.2 %
SC Mixed
Avg. Single Core Mixed Speed
137 Pts Faster single-core speed.
+16%
118 Pts
QC Mixed
Avg. Quad Core Mixed Speed
523 Pts Faster quad-core speed.
+21%
433 Pts
MC Mixed
Avg. Multi Core Mixed Speed
1080 Pts Hugely faster multi-core speed.
+143%
444 Pts
SC Mixed
OC Single Core Mixed Speed
155 Pts Slightly faster OC single-core speed.
+10%
141 Pts
QC Mixed
OC Quad Core Mixed Speed
616 Pts Slightly faster OC quad-core speed.
+14%
539 Pts
MC Mixed
OC Multi Core Mixed Speed
1248 Pts Hugely faster OC multi-core speed.
+128%
548 Pts
Market Share
Based on 12,890,891 CPUs tested.
Market Share
Market Share (trailing 30 days)
3.73 % Hugely higher market share.
+189%
1.29 %
Value
Value For Money
98.5 % Slightly better value.
+7%
91.8 %
User Rating
UBM User Rating
158 % Hugely more popular.
+100%
79 %
Price
Price (score)
$370 $232 Much cheaper.
+37%
Age
Newest
14 Months Much more recent.
+65%
40 Months
TDP
Thermal Design Power (TDP)
95 Watts 91 Watts +4%
Cores
CPU Processing Cores
6 cores Much higher core count.
+50%
4 cores
Threads
CPU Processing Threads
12 threads Hugely higher thread count.
+200%
4 threads
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
3.7 GHz Slightly faster base frequency.
+6%
3.5 GHz
Turbo Clock
Turbo Clock Speed
4.7 GHz Faster turbo frequency.
+21%
3.9 GHz
SC Int
Single Core Integer Speed
151 Pts Slightly faster single-core int speed.
+11%
136 Pts
SC Float
Single Core Floating Point Speed
160 Pts Slightly faster single-core fp speed.
+7%
149 Pts
QC Int
Quad Core Integer Speed
599 Pts Faster quad-core int speed.
+16%
516 Pts
QC Float
Quad Core Floating Point Speed
636 Pts Slightly faster quad-core fp speed.
+10%
578 Pts
MC Int
Multi Core Integer Speed
1139 Pts Hugely faster multi-core int speed.
+119%
521 Pts
MC Float
Multi Core Floating Point Speed
1322 Pts Hugely faster multi-core fp speed.
+128%
581 Pts
Series
CPU Architecture
Coffee Lake Skylake
Socket
Motherboard Socket
FCLGA1151 FCLGA1151
Graphics
Integrated Graphics
UHD 630 HD 530
Launch Date
Launch Date
Q4'17 Q3'15
Cache
Cache
12 MB 6 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2 SSE4.1/4.2, AVX 2.0
Recommended Price
Recommended Customer Price
N/A $242.00 - $243.00
Thermal Solution Specification
Thermal Solution Specification
PCG 2015C (130W) PCG 2015D (130W)
Memory Types
Memory Types
DDR4-2666 DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 Intel® HD Graphics 530
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.20 GHz 1.15 GHz
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
Yes No
vPro Tech
Intel® vPro™ Technology ‡
Yes No
Stable Image Platform Program (SIPP)
Intel® Stable Image Platform Program (SIPP)
Yes No
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
Yes No
PCI Express Configurations
PCI Express Configurations ‡
Up to 1x16 or 2x8 or 1x8+2x4 Up to 1x16, 2x8, 1x8+2x4

More specs » More specs »
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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

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

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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 Frequently Asked Questions

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CPUGPUSSD
Intel Core i7-8700K $370Nvidia GTX 1070 $330Samsung 850 Evo 250GB $63
AMD Ryzen 5 1600 $150Nvidia GTX 1060-6GB $230Samsung 850 Evo 500GB $100
Intel Core i5-8600K $240Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $110
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $125SanDisk Extreme 64GB $72
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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