IntelBX80684I78700K
IntelBX80671I76900K

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

8 Cores, 16 Threads @3.2GHz, Broadwell-E.
Release date: Q2 2016.

Real World Speed
Performance profile from 491,526 user samples
487,590 User Benchmarks
Best Bench: 104% Base clock 3.7 GHz, turbo 5.15 GHz (avg)
Worst Bench: 83% Base clock 3.7 GHz, turbo 0.8 GHz (avg)
Poor: 83% Great: 104%
SPEED RANK: 23rd / 1257
Gaming
Gaming 94%
Nuclear submarine
Desktop
Desktop 96%
Nuclear submarine
Workstation
Workstation 86%
Aircraft carrier
3,936 User Benchmarks
Best Bench: 98% Base clock 3.2 GHz, turbo 3.6 GHz (avg)
Worst Bench: 79% Base clock 3.2 GHz, turbo 3.5 GHz (avg)
Poor: 79% Great: 98%
SPEED RANK: 43rd / 1257
Gaming
Gaming 89%
Aircraft carrier
Desktop
Desktop 88%
Aircraft carrier
Workstation
Workstation 86%
Aircraft carrier
Effective Speed
Effective CPU Speed
94.4 % Slightly faster effective speed.
+6%
88.9 %
Memory
Avg. Memory Latency
93.6 Pts +3% 90.9 Pts
1-Core
Avg. Single Core Mixed Speed
136 Pts Faster single-core speed.
+18%
115 Pts
2-Core
Avg. Dual Core Mixed Speed
267 Pts Faster dual-core speed.
+15%
232 Pts
4-Core
Avg. Quad Core Mixed Speed
512 Pts Slightly faster quad-core speed.
+10%
466 Pts
8-Core
Avg. Octa Core Mixed Speed
833 Pts 865 Pts +4%
Memory
OC Memory Latency
97.5 Pts +1% 96.7 Pts
1-Core
OC Single Core Mixed Speed
154 Pts Faster OC single-core speed.
+13%
136 Pts
2-Core
OC Dual Core Mixed Speed
305 Pts Faster OC dual-core speed.
+11%
275 Pts
4-Core
OC Quad Core Mixed Speed
597 Pts Slightly faster OC quad-core speed.
+9%
548 Pts
8-Core
OC Octa Core Mixed Speed
978 Pts 1066 Pts Slightly faster OC octa-core speed.
+9%
Market Share
Based on 31,452,239 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.19 % Insanely higher market share.
+11,800%
0.01 %
Value
Value For Money
90.8 % Better value.
+28%
70.9 %
User Rating
UBM User Rating
174 % Hugely more popular.
+190%
60 %
Price
Price (score)
$320 Much cheaper.
+49%
$633
Age
Newest
34 Months Much more recent.
+32%
50 Months
TDP
Thermal Design Power (TDP)
95 Watts Much more energy efficient.
+32%
140 Watts
Cores
CPU Processing Cores
6 cores 8 cores Much higher core count.
+33%
Threads
CPU Processing Threads
12 threads 16 threads Much higher thread count.
+33%
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
3.7 GHz Faster base frequency.
+16%
3.2 GHz
Turbo Clock
Turbo Clock Speed
4.7 GHz Faster turbo frequency.
+17%
4 GHz
64-Core
OC Multi Core Mixed Speed
1204 Pts 1400 Pts Faster OC 64-core speed.
+16%
64-Core
Avg. Multi Core Mixed Speed
1041 Pts 1193 Pts Faster 64-core speed.
+15%
Series
CPU Architecture
Coffee Lake Broadwell-E
Socket
Motherboard Socket
FCLGA1151 LGA2011-V3
Graphics
Integrated Graphics
UHD 630 None
Launch Date
Launch Date
Q4'17 Q2'16
Cache
Cache
12 MB 20 MB
Max Turbo Frequency
Max Turbo Frequency
4.70 GHz 4 GHz
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 128 GB
Memory Types
Memory Types
DDR4-2666 DDR4 2400/2133
Memory Channels
Max # of Memory Channels
2 4
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 None
vPro Tech
Intel® vPro™ Technology ‡
Yes No
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
Yes No
Max # of PCI Express Lanes
Max # of PCI Express Lanes
16 40

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 Core i7-6900K is one of four new Broadwell-E prosumer CPUs. This model has eight cores with base and turbo frequencies of 3.2 and 4.0 GHz respectively. The 6900K is based on a 14 nm architecture, it has a TDP of 140 watts, 40 PCIe 3.0 lanes and no integrated graphics. Because of its MSRP of $1,100, the 6900K only makes sense for very niche use cases which include top end graphics design and video production. Comparing the 6900K and 6700K shows that for typical desktop use the 6900K only offers a gain of around 12% for a whopping three fold price increase. This is because desktop computing largely depends on single core performance and the Skylake i7-6700K is both clocked higher and has higher IPC due to its one generation lead over the 6900K. That said, as a workstation CPU the 6900K is bested only by the $2,000 flagship ten core 6950X. (6900K vs 6950X[Jun '16 CPUPro]

MORE DETAILS

Processor Rankings (Price vs Performance) August 2020 CPU Rankings.

We calculate effective speed which measures real world performance for typical users. Effective speed is adjusted by current prices to yield a value for money rating. 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.
  • - Identify the strongest components in your PC.
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  • - Share your opinion by voting.

 Frequently Asked Questions

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HDDRAMUSB
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