IntelBX80662I56600K
IntelBX80684I78700K

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

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

Real World Speed
Performance profile from 278,629 user samples
135,082 User Benchmarks
Best Bench: 104% Base clock 3.5 GHz, turbo 4.8 GHz (avg)
Worst Bench: 65% Base clock 3.5 GHz, turbo 0.75 GHz (avg)
Poor: 65% Great: 104%
SPEED RANK: 45th / 1132
Gaming
Gaming 86%
Aircraft carrier
Desktop
Desktop 84%
Aircraft carrier
Workstation
Workstation 52%
Yacht
143,547 User Benchmarks
Best Bench: 124% Base clock 3.7 GHz
Worst Bench: 90% Base clock 3.7 GHz, turbo 3.85 GHz (avg)
Poor: 90% Great: 124%
SPEED RANK: 10th / 1132
Gaming
Gaming 107%
UFO
Desktop
Desktop 104%
UFO
Workstation
Workstation 95%
Nuclear submarine
Effective Speed
Effective CPU Speed
85.7 % 107 % Faster effective speed.
+25%
SC Mixed
Avg. Single Core Mixed Speed
119 Pts 136 Pts Slightly faster single-core speed.
+14%
QC Mixed
Avg. Quad Core Mixed Speed
443 Pts 522 Pts Faster quad-core speed.
+18%
MC Mixed
Avg. Multi Core Mixed Speed
453 Pts 1078 Pts Hugely faster multi-core speed.
+138%
SC Mixed
OC Single Core Mixed Speed
141 Pts 155 Pts Slightly faster OC single-core speed.
+10%
QC Mixed
OC Quad Core Mixed Speed
547 Pts 615 Pts Slightly faster OC quad-core speed.
+12%
MC Mixed
OC Multi Core Mixed Speed
551 Pts 1244 Pts Hugely faster OC multi-core speed.
+126%
Market Share
Based on 11,636,704 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.33 % 3.72 % Hugely higher market share.
+180%
Value
Value For Money
92.4 % 97.3 % Slightly better value.
+5%
User Rating
UBM User Rating
73 % 152 % Hugely more popular.
+108%
Price
Price (score)
$238 Much cheaper.
+37%
$380
Age
Newest
38 Months 12 Months Much more recent.
+68%
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
4 threads 12 threads Hugely higher thread count.
+200%
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
3.5 GHz 3.7 GHz Slightly faster base frequency.
+6%
Turbo Clock
Turbo Clock Speed
3.9 GHz 4.7 GHz Faster turbo frequency.
+21%
SC Int
Single Core Integer Speed
137 Pts 151 Pts Slightly faster single-core int speed.
+10%
SC Float
Single Core Floating Point Speed
149 Pts 160 Pts Slightly faster single-core fp speed.
+7%
QC Int
Quad Core Integer Speed
524 Pts 599 Pts Slightly faster quad-core int speed.
+14%
QC Float
Quad Core Floating Point Speed
580 Pts 637 Pts Slightly faster quad-core fp speed.
+10%
MC Int
Multi Core Integer Speed
527 Pts 1144 Pts Hugely faster multi-core int speed.
+117%
MC Float
Multi Core Floating Point Speed
581 Pts 1325 Pts Hugely faster multi-core fp speed.
+128%
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
6 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
$242.00 - $243.00 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
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
No Yes
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 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

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) October 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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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.
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CPUGPUSSD
Intel Core i7-8700K $380Nvidia GTX 1070 $345Samsung 850 Evo 250GB $100
AMD Ryzen 5 1600 $155Nvidia GTX 1060-6GB $249Samsung 850 Evo 500GB $98
Intel Core i7-7700K $350AMD RX 480 $280Samsung 850 Pro 256GB $160
HDDRAMUSB
Seagate Barracuda 1TB (2016) $40G.SKILL Trident Z DDR4 3200 C14 4x16GB $869SanDisk Extreme 64GB $42
Seagate Barracuda 3TB (2016) $80Corsair Vengeance LPX DDR4 3000 C15 2x8GB $147SanDisk Extreme 32GB $30
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $145SanDisk Ultra Fit 32GB $12
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