IntelBX80662I56600
IntelBX80684I58400

4 Cores, 4 Threads
@3.3GHz Skylake (2015)

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

Real World Speed
Performance profile from 28,069 user samples
23,597 User Benchmarks
Best Bench: 87% Base clock 3.3 GHz
Worst Bench: 61% Base clock 3.3 GHz, turbo 0.55 GHz (avg)
Poor: 61% Great: 87%
SPEED RANK: 54th / 985
Gaming
Gaming 79%
Battleship
Desktop
Desktop 77%
Battleship
Workstation
Workstation 48%
Yacht
4,472 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: 24th / 985
Gaming
Gaming 93%
Nuclear submarine
Desktop
Desktop 89%
Aircraft carrier
Workstation
Workstation 68%
Battle cruiser
Effective Speed
Effective CPU Speed
78.8 % 92.5 % Faster effective speed.
+17%
SC Mixed
Avg. Single Core Mixed Speed
108 Pts 120 Pts Slightly faster single-core speed.
+11%
QC Mixed
Avg. Quad Core Mixed Speed
409 Pts 471 Pts Faster quad-core speed.
+15%
MC Mixed
Avg. Multi Core Mixed Speed
420 Pts 689 Pts Much faster multi-core speed.
+64%
SC Mixed
OC Single Core Mixed Speed
121 Pts 126 Pts +4%
QC Mixed
OC Quad Core Mixed Speed
453 Pts 489 Pts Slightly faster OC quad-core speed.
+8%
MC Mixed
OC Multi Core Mixed Speed
457 Pts 726 Pts Much faster OC multi-core speed.
+59%
Market Share
Based on 7,461,238 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.33 % 0.54 % Much higher market share.
+64%
Value
Value For Money
90.1 % 111 % Better value.
+23%
User Rating
UBM User Rating
74 % 113 % Much more popular.
+53%
Price
Price (score)
$204 $179 Slightly cheaper.
+12%
Age
Newest
29 Months 4 Months Hugely more recent.
+86%
TDP
Thermal Design Power (TDP)
65 Watts 65 Watts
Cores
CPU Processing Cores
4 cores 6 cores Much higher core count.
+50%
Threads
CPU Processing Threads
4 threads 6 threads Much higher thread count.
+50%
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
3.3 GHz Faster base frequency.
+18%
2.8 GHz
Turbo Clock
Turbo Clock Speed
3.9 GHz 4 GHz +3%
SC Int
Single Core Integer Speed
117 Pts 122 Pts +4%
SC Float
Single Core Floating Point Speed
124 Pts 129 Pts +4%
QC Int
Quad Core Integer Speed
442 Pts 477 Pts Slightly faster quad-core int speed.
+8%
QC Float
Quad Core Floating Point Speed
468 Pts 505 Pts Slightly faster quad-core fp speed.
+8%
MC Int
Multi Core Integer Speed
443 Pts 707 Pts Much faster multi-core int speed.
+60%
MC Float
Multi Core Floating Point Speed
469 Pts 751 Pts Much faster multi-core fp speed.
+60%
Series
CPU Architecture
Skylake (2015) Coffee Lake (2017)
Socket
Motherboard Socket
FCLGA1151 FCLGA1151
Graphics
Integrated Graphics
HD 530 UHD 630
Launch Date
Launch Date
Q3'15 Q4'17
Cache
Cache
6 MB SmartCache 9 MB
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX 2.0 SSE4.1/4.2, AVX2
Recommended Price
Recommended Customer Price
$213.00 - $224.00 N/A
Memory Types
Memory Types
DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V DDR4-2666
Processor Graphics
Processor Graphics ‡
Intel® HD Graphics 530 Intel® UHD Graphics 630
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.15 GHz 1.05 GHz
TSX-NI
Intel® TSX-NI
Yes No
vPro Tech
Intel® vPro™ Technology ‡
Yes No
Stable Image Platform Program (SIPP)
Intel® Stable Image Platform Program (SIPP)
Yes No
Trusted Execution Tech
Intel® Trusted Execution Technology ‡
Yes No
PCI Express Configurations
PCI Express Configurations ‡
Up to 1x16, 2x8, 1x8+2x4 Up to 1x16 or 2x8 or 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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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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  • 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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