IntelBX80684I58400
IntelBX80646I74790K

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

Real World Speed
Performance profile from 146,942 user samples
9,970 User Benchmarks
Best Bench: 96% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Worst Bench: 85% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Poor: 85% Great: 96%
SPEED RANK: 29th / 1084
Gaming
Gaming 92%
Nuclear submarine
Desktop
Desktop 89%
Aircraft carrier
Workstation
Workstation 67%
Battle cruiser
136,972 User Benchmarks
Best Bench: 101% Base clock 4.9 GHz, turbo 6 GHz (avg)
Worst Bench: 71% Base clock 4 GHz, turbo 0.85 GHz (avg)
Poor: 71% Great: 101%
SPEED RANK: 40th / 1084
Gaming
Gaming 88%
Aircraft carrier
Desktop
Desktop 89%
Aircraft carrier
Workstation
Workstation 64%
Destroyer
Effective Speed
Effective CPU Speed
92.1 % +5% 88.1 %
SC Mixed
Avg. Single Core Mixed Speed
120 Pts 125 Pts +4%
QC Mixed
Avg. Quad Core Mixed Speed
468 Pts Slightly faster quad-core speed.
+9%
431 Pts
MC Mixed
Avg. Multi Core Mixed Speed
687 Pts Slightly faster multi-core speed.
+8%
639 Pts
SC Mixed
OC Single Core Mixed Speed
125 Pts 139 Pts Slightly faster OC single-core speed.
+11%
QC Mixed
OC Quad Core Mixed Speed
487 Pts 514 Pts Slightly faster OC quad-core speed.
+6%
MC Mixed
OC Multi Core Mixed Speed
723 Pts 727 Pts +1%
Market Share
Based on 8,433,262 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.15 % 1.45 % Higher market share.
+26%
Value
Value For Money
111 % Much better value.
+34%
82.8 %
User Rating
UBM User Rating
107 % Slightly more popular.
+6%
101 %
Price
Price (score)
$179 Much cheaper.
+48%
$344
Age
Newest
6 Months Hugely more recent.
+87%
46 Months
TDP
Thermal Design Power (TDP)
65 Watts More energy efficient.
+26%
88 Watts
Cores
CPU Processing Cores
6 cores Much higher core count.
+50%
4 cores
Threads
CPU Processing Threads
6 threads 8 threads Much higher thread count.
+33%
Lithography
Manufacturing process
14 nm Much newer manufacturing.
+36%
22 nm
Base Clock
Base Clock Speed
2.8 GHz 4 GHz Much faster base frequency.
+43%
Turbo Clock
Turbo Clock Speed
4 GHz 4.4 GHz Slightly faster turbo frequency.
+10%
SC Int
Single Core Integer Speed
122 Pts 138 Pts Slightly faster single-core int speed.
+13%
SC Float
Single Core Floating Point Speed
129 Pts 138 Pts Slightly faster single-core fp speed.
+7%
QC Int
Quad Core Integer Speed
476 Pts 515 Pts Slightly faster quad-core int speed.
+8%
QC Float
Quad Core Floating Point Speed
504 Pts 512 Pts +2%
MC Int
Multi Core Integer Speed
703 Pts +2% 689 Pts
MC Float
Multi Core Floating Point Speed
744 Pts +0% 741 Pts
Series
CPU Architecture
Coffee Lake (2017) Haswell (2013)
Socket
Motherboard Socket
FCLGA1151 FCLGA1150
Graphics
Integrated Graphics
UHD 630 HD 4600
Launch Date
Launch Date
Q4'17 Q2'14
Cache
Cache
9 MB 8 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2 SSE4.1/4.2, AVX 2.0
Lithography
Lithography
14 nm 22 nm
Recommended Price
Recommended Customer Price
N/A $339.00 - $350.00
Bus Speed
Bus Speed
8 GT/s DMI3 5 GT/s DMI2
Thermal Solution Specification
Thermal Solution Specification
PCG 2015C (65W) PCG 2013D
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 32 GB
Memory Types
Memory Types
DDR4-2666 DDR3-1333/1600, DDR3L-1333/1600 @ 1.5V
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 Intel® HD Graphics 4600
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.05 GHz 1.25 GHz
Graphics Video Max Memory
Graphics Video Max Memory
64 GB 2 GB
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
No Yes
PCI Express Configurations
PCI Express Configurations ‡
Up to 1x16 or 2x8 or 1x8+2x4 Up to 1x16, 2x8, 1x8+2x4

More specs » More specs »
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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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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) April 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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