IntelBX80684I78700K
IntelBX80646I74790K
$348

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

VS
About
 $348 

4 Cores, 8 Threads @4.0GHz, Haswell.
Release date: Q2 2014.

Real World Speed
Performance profile from 554,575 user samples
319,061 User Benchmarks
Best Bench: 109% Base clock 3.7 GHz, turbo 5.35 GHz (avg)
Worst Bench: 77% Base clock 3.7 GHz, turbo 1.05 GHz (avg)
Poor: 77% Great: 109%
SPEED RANK: 14th / 1182
Gaming
Gaming 93%
Nuclear submarine
Desktop
Desktop 95%
Nuclear submarine
Workstation
Workstation 79%
Battleship
235,514 User Benchmarks
Best Bench: 89% Base clock 4 GHz, turbo 4.9 GHz (avg)
Worst Bench: 58% Base clock 4 GHz, turbo 0.75 GHz (avg)
Poor: 58% Great: 89%
SPEED RANK: 63rd / 1182
Gaming
Gaming 76%
Battleship
Desktop
Desktop 83%
Aircraft carrier
Workstation
Workstation 56%
Gunboat
Effective Speed
Effective CPU Speed
92.6 % Faster effective speed.
+22%
75.7 %
1-Core
Avg. Single Core Mixed Speed
137 Pts Slightly faster single-core speed.
+11%
123 Pts
2-Core
Avg. Dual Core Mixed Speed
270 Pts Slightly faster dual-core speed.
+13%
239 Pts
4-Core
Avg. Quad Core Mixed Speed
522 Pts Faster quad-core speed.
+22%
427 Pts
8-Core
Avg. Octa Core Mixed Speed
846 Pts Much faster octa-core speed.
+35%
628 Pts
64-Core
Avg. Multi Core Mixed Speed
1059 Pts Much faster 64-core speed.
+67%
636 Pts
1-Core
OC Single Core Mixed Speed
155 Pts Slightly faster OC single-core speed.
+12%
138 Pts
2-Core
OC Dual Core Mixed Speed
308 Pts Slightly faster OC dual-core speed.
+13%
272 Pts
4-Core
OC Quad Core Mixed Speed
614 Pts Faster OC quad-core speed.
+19%
517 Pts
8-Core
OC Octa Core Mixed Speed
987 Pts Much faster OC octa-core speed.
+37%
719 Pts
64-Core
OC Multi Core Mixed Speed
1224 Pts Much faster OC 64-core speed.
+69%
726 Pts
Market Share
Based on 19,404,473 CPUs tested.
Market Share
Market Share (trailing 30 days)
2.07 % Hugely higher market share.
+83%
1.13 %
Value
Value For Money
87.6 % Better value.
+23%
71.2 %
User Rating
UBM User Rating
115 % More popular.
+25%
92 %
Price
Price (score)
$340 +2% $348
Age
Newest
22 Months Much more recent.
+65%
62 Months
TDP
Thermal Design Power (TDP)
95 Watts 88 Watts Slightly more energy efficient.
+7%
Cores
CPU Processing Cores
6 cores Much higher core count.
+50%
4 cores
Threads
CPU Processing Threads
12 threads Much higher thread count.
+50%
8 threads
Lithography
Manufacturing process
14 nm Much newer manufacturing.
+36%
22 nm
Base Clock
Base Clock Speed
3.7 GHz 4 GHz Slightly faster base frequency.
+8%
Turbo Clock
Turbo Clock Speed
4.7 GHz Slightly faster turbo frequency.
+7%
4.4 GHz
Series
CPU Architecture
Coffee Lake Haswell
Socket
Motherboard Socket
FCLGA1151 FCLGA1150
Graphics
Integrated Graphics
UHD 630 HD 4600
Launch Date
Launch Date
Q4'17 Q2'14
Cache
Cache
12 MB 8 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2 SSE4.1/4.2, AVX 2.0
Lithography
Lithography
14 nm 22 nm
Recommended Price
Recommended Customer Price
N/A $339.00 - $350.00
Bus Speed
Bus Speed
8 GT/s DMI3 5 GT/s DMI2
Thermal Solution Specification
Thermal Solution Specification
PCG 2015C (130W) PCG 2013D
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 32 GB
Memory Types
Memory Types
DDR4-2666 DDR3-1333/1600, DDR3L-1333/1600 @ 1.5V
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 Intel® HD Graphics 4600
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.20 GHz 1.25 GHz
Graphics Video Max Memory
Graphics Video Max Memory
64 GB 2 GB
TSX-NI
Intel® TSX-NI
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 i7-4790K, codenamed Devil's Canyon, is an upgraded 4770K, Intel's current flagship i7. The 4790K features an improved thermal interface which enables it to dissipate heat more efficiently than the 4770K. Comparing the 4770K and 4790K shows that stock performance has improved by 13% which is consistent with the base clock jump from 3.5 GHz to 4.0 GHz. OC performance remains unchanged. Comparing the 4790K and 4790 shows that at stock clocks the 4790K is around 16% faster which considering the small price difference makes the 4790K a far better choice. Previously Intel targeted the unlocked K versions at overclockers but with Devil's Canyon they have included VT-d on the K chip and this time it's squarely aimed at both power users and overclockers alike. Until the release of Broadwell in six months, the 4790K is the high end CPU of choice. [Jul '14 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.
  • - GPU tests include: six 3D game simulations.
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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.
  • - See speed test results from other users.
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  • - Share your opinion by voting.

 Frequently Asked Questions

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