6 Cores, 12 Threads @3.3GHz, Haswell-E.
Release date: Q3 2014.

4 Cores, 8 Threads @3.3 GHz, Sandy Bridge EP.
Release date ≤ Q1 2014.

Real World Speed
Performance profile from 78,031 user samples
77,442 User Benchmarks
Best Bench: 94% Base clock 3.3 GHz, turbo 4.6 GHz (avg)
Worst Bench: 73% Base clock 3.3 GHz, turbo 3.9 GHz (avg)
Poor: 73% Great: 94%
SPEED RANK: 99th / 1257
Gaming 83%
Aircraft carrier
Desktop 83%
Aircraft carrier
Workstation 73%
589 User Benchmarks
Best Bench: 77% Base clock 3.3 GHz, turbo 3.2 GHz (avg)
Worst Bench: 61% Base clock 3.3 GHz, turbo 3.3 GHz (avg)
Poor: 61% Great: 77%
SPEED RANK: 287th / 1257
Gaming 70%
Desktop 73%
Workstation 55%
Effective Speed
Effective CPU Speed
82.8 % Faster effective speed.
70.2 %
Avg. Memory Latency
89.2 Pts +4% 85.5 Pts
Avg. Single Core Mixed Speed
106 Pts Faster single-core speed.
85.1 Pts
Avg. Dual Core Mixed Speed
212 Pts Faster dual-core speed.
169 Pts
Avg. Quad Core Mixed Speed
412 Pts Much faster quad-core speed.
299 Pts
Avg. Octa Core Mixed Speed
664 Pts Much faster octa-core speed.
432 Pts
OC Memory Latency
95.7 Pts +4% 91.8 Pts
OC Single Core Mixed Speed
129 Pts Much faster OC single-core speed.
92 Pts
OC Dual Core Mixed Speed
257 Pts Much faster OC dual-core speed.
183 Pts
OC Quad Core Mixed Speed
511 Pts Much faster OC quad-core speed.
355 Pts
OC Octa Core Mixed Speed
817 Pts Much faster OC octa-core speed.
461 Pts
Market Share
Based on 31,453,129 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.18 % Insanely higher market share.
0 %
Value For Money
90.9 % Hugely better value.
48.8 %
User Rating
UBM User Rating
94 % Much more popular.
53 %
Price (score)
$198 Hugely cheaper.
72 Months Slightly more recent.
78+ Months
OC Multi Core Mixed Speed
1012 Pts Hugely faster OC 64-core speed.
463 Pts
Avg. Multi Core Mixed Speed
830 Pts Hugely faster 64-core speed.
441 Pts
Launch Date
Launch Date
Q3'14 Q1'12
15 MB SmartCache 10 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.2, AVX 2.0, AES AVX
22 nm 32 nm
Recommended Price
Recommended Customer Price
$389.00 - $396.00 $885.00
Max Turbo Frequency
Max Turbo Frequency
3.6 GHz 3.5 GHz
Bus Speed
Bus Speed
0 GT/s 8 GT/s QPI
1S Only 2S Only
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 384 GB
Memory Types
Memory Types
DDR4 1333/1600/2133 DDR3 800/1066/1333/1600
Memory Bandwidth
Max Memory Bandwidth
68 GB/s 51.2 GB/s
ECC Memory Supported
ECC Memory Supported ‡
No Yes
Max CPU Configuration
Max CPU Configuration
1 2
Demand Based Switching
Intel® Demand Based Switching
No Yes
vPro Tech
Intel® vPro™ Technology ‡
No Yes
Identity Protection Tech
Intel® Identity Protection Technology ‡
Yes No
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
No Yes
Max # of PCI Express Lanes
Max # of PCI Express Lanes
28 40

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]


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]


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.
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

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  • - CPU tests include: integer, floating and string.
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  • - Reports are generated and presented on
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
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