IntelBX80662I76700K
IntelBX80648I75820K

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

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

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

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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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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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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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  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on userbenchmark.com.
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HDDRAMUSB
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