IntelBX80648I75820K
IntelBX80662I76700K

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

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

Real World Speed
Performance profile from 159,241 user samples
22,077 User Benchmarks
Best Bench: 105% Base clock 3.3 GHz, turbo 4.6 GHz (avg)
Worst Bench: 72% Base clock 3.3 GHz
Poor: 72% Great: 105%
SPEED RANK: 21st / 966
Gaming
Gaming 86%
Aircraft carrier
Desktop
Desktop 83%
Aircraft carrier
Workstation
Workstation 76%
Battleship
137,164 User Benchmarks
Best Bench: 106% Base clock 4 GHz, turbo 5 GHz (avg)
Worst Bench: 81% Base clock 4 GHz, turbo 0.55 GHz (avg)
Poor: 81% Great: 106%
SPEED RANK: 11th / 966
Gaming
Gaming 92%
Nuclear submarine
Desktop
Desktop 93%
Nuclear submarine
Workstation
Workstation 68%
Battle cruiser
Effective Speed
Effective CPU Speed
86.3 % -7% 92.4 % Slightly faster effective speed.
+7%
SC Mixed
Avg. Single Core Mixed Speed
107 Pts -21% 129 Pts Faster single-core speed.
+21%
QC Mixed
Avg. Quad Core Mixed Speed
423 Pts -7% 454 Pts Slightly faster quad-core speed.
+7%
MC Mixed
Avg. Multi Core Mixed Speed
870 Pts Faster multi-core speed.
+26%
692 Pts -26%
SC Mixed
OC Single Core Mixed Speed
131 Pts -10% 144 Pts Slightly faster OC single-core speed.
+10%
QC Mixed
OC Quad Core Mixed Speed
515 Pts -3% 529 Pts +3%
MC Mixed
OC Multi Core Mixed Speed
1053 Pts Much faster OC multi-core speed.
+36%
777 Pts -36%
Market Share
Based on 4,408,643 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.52 % -465% 2.94 % Hugely higher market share.
+465%
Value
Value For Money
78.6 % -17% 92 % Better value.
+17%
User Rating
UBM User Rating
74 % -34% 99 % Much more popular.
+34%
Price
Price (score)
$374 -21% $295 Cheaper.
+21%
Age
Newest
35 Months -34% 23 Months Much more recent.
+34%
TDP
Thermal Design Power (TDP)
140 Watts -35% 91 Watts Much more energy efficient.
+35%
Cores
CPU Processing Cores
6 cores Much higher core count.
+50%
4 cores -50%
Threads
CPU Processing Threads
12 threads Much higher thread count.
+50%
8 threads -50%
Lithography
Manufacturing process
22 nm -36% 14 nm Much newer manufacturing.
+36%
Base Clock
Base Clock Speed
3.3 GHz -21% 4 GHz Faster base frequency.
+21%
Turbo Clock
Turbo Clock Speed
3.6 GHz -17% 4.2 GHz Faster turbo frequency.
+17%
SC Int
Single Core Integer Speed
133 Pts -5% 140 Pts Slightly faster single-core int speed.
+5%
SC Float
Single Core Floating Point Speed
134 Pts -10% 148 Pts Slightly faster single-core fp speed.
+10%
QC Int
Quad Core Integer Speed
523 Pts 0% 523 Pts 0%
QC Float
Quad Core Floating Point Speed
531 Pts -4% 554 Pts +4%
MC Int
Multi Core Integer Speed
998 Pts Much faster multi-core int speed.
+39%
716 Pts -39%
MC Float
Multi Core Floating Point Speed
1065 Pts Much faster multi-core fp speed.
+31%
814 Pts -31%
Series
CPU Architecture
Haswell-E (2014) Skylake (2015)
Socket
Motherboard Socket
LGA2011-V3 FCLGA1151
Graphics
Integrated Graphics
None HD 530
Launch Date
Launch Date
Q3'14 Q3'15
Cache
Cache
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
Lithography
Lithography
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

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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]

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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]

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Processor Rankings (Price vs Performance) July 2017 CPU Rankings.

Welcome to our desktop CPU comparison. We calculate effective speed which measures real world performance for typical consumers. Effective speed is adjusted by price to yield a value for money rating which is geared towards gamers. Calculated values don't always paint the whole picture so we check them against hundreds of individual user ratings. The customizable table below combines these factors and more to bring you the definitive list of top CPUs. [CPUPro]

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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  • - 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 userbenchmark.com.
  • - Identify the strongest components in your PC.
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AMD Ryzen 7 1700 $268AMD RX 480 $410Samsung 850 Pro 256GB $120
Intel Core i5-7600K $235Nvidia GTX 1060-6GB $269Samsung 850 Evo 500GB $165
HDDRAMUSB
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Seagate Barracuda 7200.14 1TB $44HyperX Fury DDR4 2133 C14 2x8GB $128SanDisk Ultra Fit 32GB $13
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