IntelBX80648I75820K
IntelBX80684I58400

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

6 Cores, 6 Threads
@2.8GHz Coffee Lake (2017)

Real World Speed
Performance profile from 37,083 user samples
32,310 User Benchmarks
Best Bench: 105% Base clock 3.3 GHz, turbo 4.7 GHz (avg)
Worst Bench: 67% Base clock 3.3 GHz, turbo 1.2 GHz (avg)
Poor: 67% Great: 105%
SPEED RANK: 37th / 985
Gaming
Gaming 85%
Aircraft carrier
Desktop
Desktop 82%
Aircraft carrier
Workstation
Workstation 74%
Battleship
4,773 User Benchmarks
Best Bench: 96% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 88% Base clock 2.8 GHz, turbo 1.1 GHz (avg)
Poor: 88% Great: 96%
SPEED RANK: 23rd / 985
Gaming
Gaming 93%
Nuclear submarine
Desktop
Desktop 89%
Aircraft carrier
Workstation
Workstation 68%
Battle cruiser
Effective Speed
Effective CPU Speed
84.9 % 92.5 % Slightly faster effective speed.
+9%
SC Mixed
Avg. Single Core Mixed Speed
106 Pts 120 Pts Slightly faster single-core speed.
+13%
QC Mixed
Avg. Quad Core Mixed Speed
417 Pts 471 Pts Slightly faster quad-core speed.
+13%
MC Mixed
Avg. Multi Core Mixed Speed
841 Pts Faster multi-core speed.
+22%
691 Pts
SC Mixed
OC Single Core Mixed Speed
131 Pts +4% 126 Pts
QC Mixed
OC Quad Core Mixed Speed
520 Pts Slightly faster OC quad-core speed.
+6%
490 Pts
MC Mixed
OC Multi Core Mixed Speed
1028 Pts Much faster OC multi-core speed.
+41%
729 Pts
Market Share
Based on 7,515,242 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.43 % 0.62 % Much higher market share.
+44%
Value
Value For Money
76.2 % 111 % Much better value.
+46%
User Rating
UBM User Rating
84 % 113 % Much more popular.
+35%
Price
Price (score)
$390 $179 Much cheaper.
+54%
Age
Newest
42 Months 4 Months Hugely more recent.
+90%
TDP
Thermal Design Power (TDP)
140 Watts 65 Watts Much more energy efficient.
+54%
Cores
CPU Processing Cores
6 cores 6 cores
Threads
CPU Processing Threads
12 threads Hugely higher thread count.
+100%
6 threads
Lithography
Manufacturing process
22 nm 14 nm Much newer manufacturing.
+36%
Base Clock
Base Clock Speed
3.3 GHz Faster base frequency.
+18%
2.8 GHz
Turbo Clock
Turbo Clock Speed
3.6 GHz 4 GHz Slightly faster turbo frequency.
+11%
SC Int
Single Core Integer Speed
130 Pts Slightly faster single-core int speed.
+7%
122 Pts
SC Float
Single Core Floating Point Speed
130 Pts +1% 129 Pts
QC Int
Quad Core Integer Speed
517 Pts Slightly faster quad-core int speed.
+8%
478 Pts
QC Float
Quad Core Floating Point Speed
520 Pts +3% 506 Pts
MC Int
Multi Core Integer Speed
978 Pts Much faster multi-core int speed.
+38%
709 Pts
MC Float
Multi Core Floating Point Speed
1048 Pts Much faster multi-core fp speed.
+39%
752 Pts
Series
CPU Architecture
Haswell-E (2014) Coffee Lake (2017)
Socket
Motherboard Socket
LGA2011-V3 FCLGA1151
Graphics
Integrated Graphics
None UHD 630
Launch Date
Launch Date
Q3'14 Q4'17
Cache
Cache
15 MB SmartCache 9 MB
Instruction Set Extensions
Instruction Set Extensions
SSE4.2, AVX 2.0, AES SSE4.1/4.2, AVX2
Lithography
Lithography
22 nm 14 nm
Recommended Price
Recommended Customer Price
$389.00 - $396.00 N/A
Bus Speed
Bus Speed
0 GT/s 8 GT/s DMI3
Memory Types
Memory Types
DDR4 1333/1600/2133 DDR4-2666
Memory Channels
Max # of Memory Channels
4 2
Processor Graphics
Processor Graphics ‡
None Intel® UHD Graphics 630
Package Size
Package Size
52.5mm x 45.0mm 37.5mm x 37.5mm
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
Yes No
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 i5-8400 is a competitively priced hex-core processor from Intel’s 8th generation of Core processors (Coffee Lake). Along with the release of the unlocked i5-8600K, this is the first time that six-core processors have featured in the i5 line-up. Like the other Coffee Lake processors, the i5-8400 is based upon an improved version of Intel’s 14nm architecture which featured in both Skylake and Kaby Lake. Early benchmarks reveal that for average quad core usage (most games employ a maximum of four cores) the i5-8400 performs way above its pay grade. It achieves quad core mixed speeds close to Intel’s outgoing 2017 flagship the $300, quad-core, 8 thread i7-7700k, which to date has been a strong favourite for high-end gaming setups. On paper, the i5-8400 has a base clock of 2.8 GHz (Intel are significantly downplaying the performance of this SKU by giving it a relatively low nominal base clock), an all core boost of 3.8 GHz (this is the effective base clock figure that counts) and a single core boost of 4 GHz. This compares reasonably well to the i5-8600K which has a base clock of 3.6 GHz, all core boost of 4.1 GHz and a single core boost of 4.3 GHz. The i5-8400 also features 9MB of L3 cache and an energy-thrifty TDP of 65W. Priced at under $190, the i5-8400 offers fantastic value for money. Unfortunately, like the other Coffee Lake processors, the i5-8400 will require a new 300 series motherboard, and at the time of writing, the only available version is Intel’s high-end Z370 which isn't an ideal pairing for the i5-8400. The Z series motherboards are designed to cater for the unlocked and overclockable "K" SKUs. Cheaper 300 series motherboards will be available in 2018 at which time the 8400 will offer even better value for money. [Oct '17 CPUPro]

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Processor Rankings (Price vs Performance) February 2018 CPU Rankings.

We calculate effective speed which measures real world performance for typical consumers. Effective speed is adjusted by current prices to yield a value for money rating which is geared towards gamers. 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]

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Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
  • Best value for money - Value for money is based on real world performance and price.
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