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 157,547 user samples
23,335 User Benchmarks
Best Bench: 103% Base clock 3.3 GHz, turbo 4.7 GHz (avg)
Worst Bench: 69% Base clock 3.3 GHz, turbo 1.2 GHz (avg)
Poor: 69% Great: 103%
SPEED RANK: 27th / 971
Gaming
Gaming 85%
Aircraft carrier
Desktop
Desktop 82%
Aircraft carrier
Workstation
Workstation 75%
Battleship
134,212 User Benchmarks
Best Bench: 106% Base clock 4 GHz, turbo 4.8 GHz (avg)
Worst Bench: 79% Base clock 4 GHz, turbo 0.8 GHz (avg)
Poor: 79% Great: 106%
SPEED RANK: 16th / 971
Gaming
Gaming 92%
Nuclear submarine
Desktop
Desktop 92%
Nuclear submarine
Workstation
Workstation 68%
Battle cruiser
Effective Speed
Effective CPU Speed
84.7 % -8% 91.6 % Slightly faster effective speed.
+8%
SC Mixed
Avg. Single Core Mixed Speed
106 Pts -21% 128 Pts Faster single-core speed.
+21%
QC Mixed
Avg. Quad Core Mixed Speed
414 Pts -9% 450 Pts Slightly faster quad-core speed.
+9%
MC Mixed
Avg. Multi Core Mixed Speed
851 Pts Faster multi-core speed.
+24%
685 Pts -24%
SC Mixed
OC Single Core Mixed Speed
128 Pts -12% 144 Pts Slightly faster OC single-core speed.
+12%
QC Mixed
OC Quad Core Mixed Speed
507 Pts -5% 533 Pts Slightly faster OC quad-core speed.
+5%
MC Mixed
OC Multi Core Mixed Speed
1033 Pts Much faster OC multi-core speed.
+32%
780 Pts -32%
Market Share
Based on 5,137,357 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.5 % -396% 2.48 % Hugely higher market share.
+396%
Value
Value For Money
75.9 % -17% 89.1 % Better value.
+17%
User Rating
UBM User Rating
76 % -32% 100 % Much more popular.
+32%
Price
Price (score)
$391 -20% $314 Cheaper.
+20%
Age
Newest
37 Months -32% 25 Months Much more recent.
+32%
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
130 Pts -8% 141 Pts Slightly faster single-core int speed.
+8%
SC Float
Single Core Floating Point Speed
132 Pts -12% 148 Pts Slightly faster single-core fp speed.
+12%
QC Int
Quad Core Integer Speed
518 Pts 0% 518 Pts 0%
QC Float
Quad Core Floating Point Speed
522 Pts -5% 546 Pts +5%
MC Int
Multi Core Integer Speed
986 Pts Much faster multi-core int speed.
+37%
718 Pts -37%
MC Float
Multi Core Floating Point Speed
1045 Pts Faster multi-core fp speed.
+28%
816 Pts -28%
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

More specs » More specs »
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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) September 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]

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Intel Core i7-7700K $295Nvidia GTX 1070 $410Samsung 850 Evo 250GB $97
AMD Ryzen 7 1700 $270AMD RX 480 $350Samsung 850 Pro 256GB $120
Intel Core i5-7600K $210Nvidia GTX 1060-6GB $265Samsung 850 Evo 500GB $150
HDDRAMUSB
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Seagate Barracuda 7200.14 1TB $56HyperX Fury DDR4 2133 C14 2x8GB $141SanDisk Extreme 16GB $20
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