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

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

Real World Speed
Performance profile from 215,398 user samples
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%
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
Effective Speed
Effective CPU Speed
85.9 % 90.8 % Slightly faster effective speed.
SC Mixed
Avg. Single Core Mixed Speed
108 Pts 128 Pts Faster single-core speed.
QC Mixed
Avg. Quad Core Mixed Speed
420 Pts 444 Pts Slightly faster quad-core speed.
MC Mixed
Avg. Multi Core Mixed Speed
851 Pts Faster multi-core speed.
679 Pts
SC Mixed
OC Single Core Mixed Speed
130 Pts 145 Pts Slightly faster OC single-core speed.
QC Mixed
OC Quad Core Mixed Speed
510 Pts 531 Pts +4%
MC Mixed
OC Multi Core Mixed Speed
1025 Pts Much faster OC multi-core speed.
777 Pts
Market Share
Based on 7,884,273 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.4 % 1.94 % Hugely higher market share.
Value For Money
76.9 % 87.4 % Slightly better value.
User Rating
UBM User Rating
83 % 94 % Slightly more popular.
Price (score)
$391 $323 Cheaper.
43 Months 31 Months More recent.
Thermal Design Power (TDP)
140 Watts 91 Watts Much more energy efficient.
CPU Processing Cores
6 cores Much higher core count.
4 cores
CPU Processing Threads
12 threads Much higher thread count.
8 threads
Manufacturing process
22 nm 14 nm Much newer manufacturing.
Base Clock
Base Clock Speed
3.3 GHz 4 GHz Faster base frequency.
Turbo Clock
Turbo Clock Speed
3.6 GHz 4.2 GHz Faster turbo frequency.
SC Int
Single Core Integer Speed
130 Pts 142 Pts Slightly faster single-core int speed.
SC Float
Single Core Floating Point Speed
129 Pts 148 Pts Slightly faster single-core fp speed.
QC Int
Quad Core Integer Speed
511 Pts 522 Pts +2%
QC Float
Quad Core Floating Point Speed
510 Pts 552 Pts Slightly faster quad-core fp speed.
MC Int
Multi Core Integer Speed
976 Pts Much faster multi-core int speed.
712 Pts
MC Float
Multi Core Floating Point Speed
1044 Pts Faster multi-core fp speed.
817 Pts
CPU Architecture
Haswell-E (2014) Skylake (2015)
Motherboard Socket
LGA2011-V3 FCLGA1151
Integrated Graphics
None HD 530
Launch Date
Launch Date
Q3'14 Q3'15
15 MB SmartCache 8 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.2, AVX 2.0, AES SSE4.1/4.2, AVX 2.0
22 nm 14 nm
Recommended Price
Recommended Customer Price
$389.00 - $396.00 $339.00 - $350.00
Bus Speed
Bus Speed
0 GT/s 8 GT/s DMI3
Memory Types
Memory Types
DDR4 1333/1600/2133 DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V
Memory Channels
Max # of Memory Channels
4 2
Memory Bandwidth
Max Memory Bandwidth
68 GB/s 34.1 GB/s
Processor Graphics
Processor Graphics ‡
None Intel® HD Graphics 530
Package Size
Package Size
52.5mm x 45.0mm 37.5mm x 37.5mm
Max # of PCI Express Lanes
Max # of PCI Express Lanes
28 16

More specs » More specs »

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]


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]


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.

 Frequently Asked Questions

 Best User Rated

The Best.
Intel Core i7-8700K $330Nvidia GTX 1070 $447Samsung 850 Evo 250GB $90
Intel Core i7-7700K $290Nvidia GTX 1060-6GB $335Samsung 850 Evo 500GB $149
AMD Ryzen 5 1600 $189AMD RX 480 $400Samsung 850 Pro 256GB $131
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $198SanDisk Extreme 64GB $44
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $931SanDisk Extreme 32GB $23
Seagate Barracuda 7200.14 1TB $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $205SanDisk Extreme 16GB $18
Today's hottest deals
User Guide  •  About  •  FAQs  •  @Email  •  Privacy  •  Developer Feedback