IntelBX80662I56600K
IntelBX80684I78700K

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

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About

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

Real World Speed
Performance profile from 544,226 user samples
208,241 User Benchmarks
Best Bench: 85% Base clock 3.5 GHz, turbo 4.8 GHz (avg)
Worst Bench: 51% Base clock 3.5 GHz, turbo 0.75 GHz (avg)
Poor: 51% Great: 85%
SPEED RANK: 95th / 1182
Gaming
Gaming 69%
Battle cruiser
Desktop
Desktop 80%
Aircraft carrier
Workstation
Workstation 42%
Speed boat
335,985 User Benchmarks
Best Bench: 107% Base clock 3.7 GHz, turbo 5.25 GHz (avg)
Worst Bench: 77% Base clock 3.7 GHz, turbo 1.75 GHz (avg)
Poor: 77% Great: 107%
SPEED RANK: 14th / 1182
Gaming
Gaming 92%
Nuclear submarine
Desktop
Desktop 94%
Nuclear submarine
Workstation
Workstation 78%
Battleship
Effective Speed
Effective CPU Speed
68.9 % 92.1 % Much faster effective speed.
+34%
1-Core
Avg. Single Core Mixed Speed
117 Pts 137 Pts Faster single-core speed.
+17%
2-Core
Avg. Dual Core Mixed Speed
232 Pts 269 Pts Faster dual-core speed.
+16%
4-Core
Avg. Quad Core Mixed Speed
428 Pts 519 Pts Faster quad-core speed.
+21%
8-Core
Avg. Octa Core Mixed Speed
437 Pts 842 Pts Hugely faster octa-core speed.
+93%
64-Core
Avg. Multi Core Mixed Speed
440 Pts 1057 Pts Hugely faster 64-core speed.
+140%
1-Core
OC Single Core Mixed Speed
139 Pts 155 Pts Slightly faster OC single-core speed.
+12%
2-Core
OC Dual Core Mixed Speed
276 Pts 308 Pts Slightly faster OC dual-core speed.
+12%
4-Core
OC Quad Core Mixed Speed
532 Pts 610 Pts Slightly faster OC quad-core speed.
+15%
8-Core
OC Octa Core Mixed Speed
533 Pts 981 Pts Hugely faster OC octa-core speed.
+84%
64-Core
OC Multi Core Mixed Speed
534 Pts 1215 Pts Hugely faster OC 64-core speed.
+128%
Market Share
Based on 19,510,653 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.9 % 2.08 % Hugely higher market share.
+131%
Value
Value For Money
74.5 % 87.2 % Better value.
+17%
User Rating
UBM User Rating
73 % 114 % Much more popular.
+56%
Price
Price (score)
$210 Much cheaper.
+38%
$339
Age
Newest
48 Months 22 Months Much more recent.
+54%
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%
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) August 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 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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  • - CPU tests include: integer, floating and string.
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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.
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CPUGPUSSD
Intel Core i5-9400F $140Nvidia GTX 1660 $220Samsung 850 Evo 250GB $86
Intel Core i5-9600K $219Nvidia GTX 1660-Ti $269Samsung 850 Evo 500GB $102
AMD Ryzen 5 3600 $198AMD RX 5700 XT $400Samsung 850 Pro 256GB $97
HDDRAMUSB
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WD Blue 1TB (2012) $42G.SKILL Trident Z DDR4 3200 C14 4x16GB $695SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $80Corsair Vengeance LPX DDR4 3200 C16 2x8GB $80SanDisk Extreme 16GB $24
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