6 Cores, 12 Threads
@3.4GHz Broadwell-E (2016)

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

Real World Speed
Performance profile from 44,716 user samples
12,315 User Benchmarks
Best Bench: 106% Base clock 3.4 GHz, turbo 4.5 GHz (avg)
Worst Bench: 79% Base clock 3.4 GHz, turbo 0.2 GHz (avg)
Poor: 79% Great: 106%
SPEED RANK: 27th / 1052
Gaming 91%
Nuclear submarine
Desktop 87%
Aircraft carrier
Workstation 79%
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
90.9 % Slightly faster effective speed.
85.9 %
SC Mixed
Avg. Single Core Mixed Speed
114 Pts Slightly faster single-core speed.
108 Pts
QC Mixed
Avg. Quad Core Mixed Speed
447 Pts Slightly faster quad-core speed.
420 Pts
MC Mixed
Avg. Multi Core Mixed Speed
888 Pts +4% 851 Pts
SC Mixed
OC Single Core Mixed Speed
132 Pts +2% 130 Pts
QC Mixed
OC Quad Core Mixed Speed
526 Pts +3% 510 Pts
MC Mixed
OC Multi Core Mixed Speed
1028 Pts +0% 1025 Pts
Market Share
Based on 7,906,321 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.17 % 0.23 % Much higher market share.
Value For Money
82.4 % Slightly better value.
76.9 %
User Rating
UBM User Rating
68 % 83 % More popular.
Price (score)
$379 +3% $391
21 Months Much more recent.
43 Months
Thermal Design Power (TDP)
140 Watts 140 Watts
CPU Processing Cores
6 cores 6 cores
CPU Processing Threads
12 threads 12 threads
Manufacturing process
14 nm Much newer manufacturing.
22 nm
Base Clock
Base Clock Speed
3.4 GHz +3% 3.3 GHz
Turbo Clock
Turbo Clock Speed
3.8 GHz Slightly faster turbo frequency.
3.6 GHz
SC Int
Single Core Integer Speed
125 Pts 130 Pts +4%
SC Float
Single Core Floating Point Speed
139 Pts Slightly faster single-core fp speed.
129 Pts
QC Int
Quad Core Integer Speed
500 Pts 511 Pts +2%
QC Float
Quad Core Floating Point Speed
551 Pts Slightly faster quad-core fp speed.
510 Pts
MC Int
Multi Core Integer Speed
947 Pts 976 Pts +3%
MC Float
Multi Core Floating Point Speed
1097 Pts Slightly faster multi-core fp speed.
1044 Pts
CPU Architecture
Broadwell-E (2016) Haswell-E (2014)
Motherboard Socket
LGA2011-V3 LGA2011-V3
Integrated Graphics
None None
Launch Date
Launch Date
Q2'16 Q3'14
15 MB 15 MB SmartCache
14 nm 22 nm
Recommended Price
Recommended Customer Price
N/A $389.00 - $396.00
Max Memory Size
Max Memory Size (dependent on memory type)
128 GB 64 GB
Memory Types
Memory Types
DDR4 2400/2133 DDR4 1333/1600/2133

More specs » More specs »

The Core i7-6800K is the weakest of four new 14 nm Broadwell-E prosumer CPUs. This model has six cores with base and turbo frequencies of 3.4 and 3.8 GHz, a TDP of 140 watts and 28 PCIe 3.0 lanes. The 6800K closely matches, and supersedes, the very popular Haswell-E 5820K. Because of its MSRP of around $500, this CPU only makes sense for niche use cases which include graphics design, video production or multi GPU gaming. Comparing the 6800K and 6700K shows that for typical desktop use, at stock clocks, the 6800K actually lags the 6700K by around 10%. This is because desktop computing largely depends on single core performance and the Skylake i7-6700K is both clocked higher (Base clock 4.0 GHz vs 3.4 GHz) and has higher IPC due to its one generation lead over the 6800K. If the 6800K proves to be a capable overclocker then it may challenge the 6700K on a range of core-heavy use cases, time will tell. [Jun '16 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.

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How it works

  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
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  • - 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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Intel Core i5-8600K $235AMD RX 480 $400Samsung 850 Pro 256GB $121
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