4 Cores, 8 Threads
@4.0GHz Skylake (2015)

6 Cores, 12 Threads
@3.3GHz Haswell-E (2014)

Real World Speed
Performance profile from 215,398 user samples
182,997 User Benchmarks
Best Bench: 105% Base clock 4 GHz, turbo 4.9 GHz (avg)
Worst Bench: 77% Base clock 4 GHz, turbo 0.8 GHz (avg)
Poor: 77% Great: 105%
SPEED RANK: 28th / 1052
Gaming 91%
Nuclear submarine
Desktop 92%
Nuclear submarine
Workstation 67%
Battle cruiser
32,401 User Benchmarks
Best Bench: 104% Base clock 3.3 GHz, turbo 4.6 GHz (avg)
Worst Bench: 71% Base clock 3.3 GHz, turbo 1.2 GHz (avg)
Poor: 71% Great: 104%
SPEED RANK: 38th / 1052
Gaming 86%
Aircraft carrier
Desktop 83%
Aircraft carrier
Workstation 75%
Effective Speed
Effective CPU Speed
90.8 % Slightly faster effective speed.
85.9 %
SC Mixed
Avg. Single Core Mixed Speed
128 Pts Faster single-core speed.
108 Pts
QC Mixed
Avg. Quad Core Mixed Speed
444 Pts Slightly faster quad-core speed.
420 Pts
MC Mixed
Avg. Multi Core Mixed Speed
679 Pts 851 Pts Faster multi-core speed.
SC Mixed
OC Single Core Mixed Speed
145 Pts Slightly faster OC single-core speed.
130 Pts
QC Mixed
OC Quad Core Mixed Speed
531 Pts +4% 510 Pts
MC Mixed
OC Multi Core Mixed Speed
777 Pts 1025 Pts Much faster OC multi-core speed.
Market Share
Based on 7,884,273 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.94 % Hugely higher market share.
0.4 %
Value For Money
87.4 % Slightly better value.
76.9 %
User Rating
UBM User Rating
94 % Slightly more popular.
83 %
Price (score)
$323 Cheaper.
31 Months More recent.
43 Months
Thermal Design Power (TDP)
91 Watts Much more energy efficient.
140 Watts
CPU Processing Cores
4 cores 6 cores Much higher core count.
CPU Processing Threads
8 threads 12 threads Much higher thread count.
Manufacturing process
14 nm Much newer manufacturing.
22 nm
Base Clock
Base Clock Speed
4 GHz Faster base frequency.
3.3 GHz
Turbo Clock
Turbo Clock Speed
4.2 GHz Faster turbo frequency.
3.6 GHz
SC Int
Single Core Integer Speed
142 Pts Slightly faster single-core int speed.
130 Pts
SC Float
Single Core Floating Point Speed
148 Pts Slightly faster single-core fp speed.
129 Pts
QC Int
Quad Core Integer Speed
522 Pts +2% 511 Pts
QC Float
Quad Core Floating Point Speed
552 Pts Slightly faster quad-core fp speed.
510 Pts
MC Int
Multi Core Integer Speed
712 Pts 976 Pts Much faster multi-core int speed.
MC Float
Multi Core Floating Point Speed
817 Pts 1044 Pts Faster multi-core fp speed.
CPU Architecture
Skylake (2015) Haswell-E (2014)
Motherboard Socket
FCLGA1151 LGA2011-V3
Integrated Graphics
HD 530 None
Launch Date
Launch Date
Q3'15 Q3'14
8 MB SmartCache 15 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX 2.0 SSE4.2, AVX 2.0, AES
14 nm 22 nm
Recommended Price
Recommended Customer Price
$339.00 - $350.00 $389.00 - $396.00
Bus Speed
Bus Speed
8 GT/s DMI3 0 GT/s
Memory Types
Memory Types
DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V DDR4 1333/1600/2133
Memory Channels
Max # of Memory Channels
2 4
Memory Bandwidth
Max Memory Bandwidth
34.1 GB/s 68 GB/s
Processor Graphics
Processor Graphics ‡
Intel® HD Graphics 530 None
Package Size
Package Size
37.5mm x 37.5mm 52.5mm x 45.0mm
Max # of PCI Express Lanes
Max # of PCI Express Lanes
16 28

More specs » More specs »

The Core i7-6700K is Intel's latest "Skylake" flagship processor. It replaces the hugely successful i7-4790K and takes the crown as the fastest mainstream consumer CPU available. Comparing performance and specs between the 4790K and 6700K shows that the configuration is largely unchanged (same base clocks, cores, threads) but the improved manufacturing process (14nm) brings a small reduction in TDP and a performance improvement of 8%; almost exactly the same jump as between the Ivy Bridge 3770K and Haswell 4770K. Owners of any unlocked-K Intel CPU from Sandy Bridge or onwards still have no real reason to upgrade as the performance improvements are largely academic but the i7-6700K will be the CPU of choice for the vast majority of top end PC builds in 2015. [Aug '15 CPUPro]


The Intel Core i7-5820K is the cheapest of three (5820K,5930K,5960X) new Haswell-E prosumer/enthusiast processors. The 5820K sports six physical cores and twelve threads which allow for enormous processing throughput. Unfortunately Intel have somewhat handicapped the 5820K by setting its base clock at just 3.3 GHz, 0.7GHz lower than the class leading 4790K. Comparing the 4790K and 5820K shows that the cheaper i7-4790K is significantly faster at both single and dual threaded workloads. The additional two cores found in the 5820K are not relevant to general computing and as such the 5820K probably makes a better server rather than consumer proposition. The Haswell-E X99 architecture also requires DDR4 RAM which is currently far more expensive than DDR3. Overall the 5820K is a very expensive option and probably best avoided by the vast majority of consumers.  [Sep '14 CPUPro]


Processor Rankings (Price vs Performance) March 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]


Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
  • Best value for money - Value for money is based on real world performance and price.
How Fast Is Your CPU? (Bench your build) Size up your PC in less than a minute.

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.

UserBenchmark of the month

How it works

  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.

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