IntelBX80648I75820K
IntelBX80646I74790K

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

Real World Speed
Performance profile from 125,511 user samples
26,187 User Benchmarks
Best Bench: 103% Base clock 3.3 GHz, turbo 4.7 GHz (avg)
Worst Bench: 72% Base clock 3.3 GHz, turbo 0.9 GHz (avg)
Poor: 72% Great: 103%
SPEED RANK: 23rd / 967
Gaming
Gaming 85%
Aircraft carrier
Desktop
Desktop 82%
Aircraft carrier
Workstation
Workstation 75%
Battleship
99,324 User Benchmarks
Best Bench: 100% Base clock 5 GHz, turbo 6.25 GHz (avg)
Worst Bench: 76% Base clock 4 GHz, turbo 1 GHz (avg)
Poor: 76% Great: 100%
SPEED RANK: 20th / 967
Gaming
Gaming 87%
Aircraft carrier
Desktop
Desktop 88%
Aircraft carrier
Workstation
Workstation 64%
Destroyer
Effective Speed
Effective CPU Speed
85.3 % -3% 87.5 % +3%
SC Mixed
Avg. Single Core Mixed Speed
106 Pts -16% 123 Pts Faster single-core speed.
+16%
QC Mixed
Avg. Quad Core Mixed Speed
418 Pts -3% 429 Pts +3%
MC Mixed
Avg. Multi Core Mixed Speed
858 Pts Much faster multi-core speed.
+33%
646 Pts -33%
SC Mixed
OC Single Core Mixed Speed
128 Pts -6% 136 Pts Slightly faster OC single-core speed.
+6%
QC Mixed
OC Quad Core Mixed Speed
509 Pts +1% 504 Pts -1%
MC Mixed
OC Multi Core Mixed Speed
1039 Pts Much faster OC multi-core speed.
+44%
724 Pts -44%
Market Share
Based on 4,683,191 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.52 % -279% 1.97 % Hugely higher market share.
+279%
Value
Value For Money
77.7 % -6% 82.7 % Slightly better value.
+6%
User Rating
UBM User Rating
75 % -31% 98 % Much more popular.
+31%
Price
Price (score)
$374 -9% $339 Slightly cheaper.
+9%
Age
Newest
36 Months Slightly more recent.
+5%
38 Months -5%
TDP
Thermal Design Power (TDP)
140 Watts -37% 88 Watts Much more energy efficient.
+37%
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 0% 22 nm 0%
Base Clock
Base Clock Speed
3.3 GHz -21% 4 GHz Faster base frequency.
+21%
Turbo Clock
Turbo Clock Speed
3.6 GHz -22% 4.4 GHz Faster turbo frequency.
+22%
SC Int
Single Core Integer Speed
130 Pts -6% 138 Pts Slightly faster single-core int speed.
+6%
SC Float
Single Core Floating Point Speed
133 Pts -5% 139 Pts +5%
QC Int
Quad Core Integer Speed
517 Pts +1% 514 Pts -1%
QC Float
Quad Core Floating Point Speed
528 Pts +2% 516 Pts -2%
MC Int
Multi Core Integer Speed
989 Pts Much faster multi-core int speed.
+43%
690 Pts -43%
MC Float
Multi Core Floating Point Speed
1049 Pts Much faster multi-core fp speed.
+43%
733 Pts -43%
Series
CPU Architecture
Haswell-E (2014) Haswell (2013)
Socket
Motherboard Socket
LGA2011-V3 FCLGA1150
Graphics
Integrated Graphics
None HD 4600
Launch Date
Launch Date
Q3'14 Q2'14
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
Recommended Price
Recommended Customer Price
$389.00 - $396.00 $339.00 - $350.00
Bus Speed
Bus Speed
0 GT/s 5 GT/s DMI2
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 32 GB
Memory Types
Memory Types
DDR4 1333/1600/2133 DDR3-1333/1600, DDR3L-1333/1600 @ 1.5V
Memory Channels
Max # of Memory Channels
4 2
Memory Bandwidth
Max Memory Bandwidth
68 GB/s 25.6 GB/s
Processor Graphics
Processor Graphics ‡
None Intel® HD Graphics 4600
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 Intel Core i7-4790K, codenamed Devil's Canyon, is an upgraded 4770K, Intel's current flagship i7. The 4790K features an improved thermal interface which enables it to dissipate heat more efficiently than the 4770K. Comparing the 4770K and 4790K shows that stock performance has improved by 13% which is consistent with the base clock jump from 3.5 GHz to 4.0 GHz. OC performance remains unchanged. Comparing the 4790K and 4790 shows that at stock clocks the 4790K is around 16% faster which considering the small price difference makes the 4790K a far better choice. Previously Intel targeted the unlocked K versions at overclockers but with Devil's Canyon they have included VT-d on the K chip and this time it's squarely aimed at both power users and overclockers alike. Until the release of Broadwell in six months, the 4790K is the high end CPU of choice. [Jul '14 CPUPro]

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Processor Rankings (Price vs Performance) August 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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  • - CPU tests include: integer, floating and string.
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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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CPUGPUSSD
Intel Core i7-7700K $307Nvidia GTX 1070 $400Samsung 850 Evo 250GB $99
AMD Ryzen 7 1700 $291AMD RX 480 $265Samsung 850 Pro 256GB $130
Intel Core i5-7600K $217Nvidia GTX 1060-6GB $275Samsung 850 Evo 500GB $155
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45G.SKILL Trident Z DDR4 3200 C14 4x16GB $718SanDisk Extreme 64GB $45
Seagate Barracuda 3TB (2016) $83Corsair Vengeance LPX DDR4 3000 C15 2x8GB $140SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $55HyperX Fury DDR4 2133 C14 2x8GB $140SanDisk Ultra Fit 32GB $13
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