IntelBX80684I58400
IntelBX80662I56500

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

4 Cores, 4 Threads
@3.2GHz Skylake (2015)

Real World Speed
Performance profile from 54,796 user samples
4,322 User Benchmarks
Best Bench: 96% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 87% Base clock 2.8 GHz, turbo 1.7 GHz (avg)
Poor: 87% Great: 96%
SPEED RANK: 24th / 985
Gaming
Gaming 93%
Nuclear submarine
Desktop
Desktop 89%
Aircraft carrier
Workstation
Workstation 68%
Battle cruiser
50,474 User Benchmarks
Best Bench: 80% Base clock 2.3 GHz, turbo 3.2 GHz (avg)
Worst Bench: 56% Base clock 3.2 GHz, turbo 0.8 GHz (avg)
Poor: 56% Great: 80%
SPEED RANK: 93rd / 985
Gaming
Gaming 72%
Battleship
Desktop
Desktop 71%
Battleship
Workstation
Workstation 44%
Speed boat
Effective Speed
Effective CPU Speed
92.6 % Faster effective speed.
+28%
72.4 %
SC Mixed
Avg. Single Core Mixed Speed
120 Pts Faster single-core speed.
+20%
99.6 Pts
QC Mixed
Avg. Quad Core Mixed Speed
472 Pts Faster quad-core speed.
+26%
375 Pts
MC Mixed
Avg. Multi Core Mixed Speed
689 Pts Much faster multi-core speed.
+78%
386 Pts
SC Mixed
OC Single Core Mixed Speed
126 Pts Slightly faster OC single-core speed.
+12%
112 Pts
QC Mixed
OC Quad Core Mixed Speed
489 Pts Faster OC quad-core speed.
+18%
415 Pts
MC Mixed
OC Multi Core Mixed Speed
725 Pts Much faster OC multi-core speed.
+73%
419 Pts
Market Share
Based on 7,391,669 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.49 % 0.89 % Hugely higher market share.
+82%
Value
Value For Money
111 % Much better value.
+32%
84.2 %
User Rating
UBM User Rating
112 % Much more popular.
+37%
82 %
Price
Price (score)
$179 Slightly cheaper.
+8%
$195
Age
Newest
4 Months Hugely more recent.
+86%
29 Months
TDP
Thermal Design Power (TDP)
65 Watts 65 Watts
Cores
CPU Processing Cores
6 cores Much higher core count.
+50%
4 cores
Threads
CPU Processing Threads
6 threads Much higher thread count.
+50%
4 threads
Lithography
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
2.8 GHz 3.2 GHz Slightly faster base frequency.
+14%
Turbo Clock
Turbo Clock Speed
4 GHz Slightly faster turbo frequency.
+11%
3.6 GHz
SC Int
Single Core Integer Speed
122 Pts Slightly faster single-core int speed.
+13%
108 Pts
SC Float
Single Core Floating Point Speed
129 Pts Slightly faster single-core fp speed.
+12%
115 Pts
QC Int
Quad Core Integer Speed
477 Pts Faster quad-core int speed.
+17%
406 Pts
QC Float
Quad Core Floating Point Speed
504 Pts Faster quad-core fp speed.
+18%
428 Pts
MC Int
Multi Core Integer Speed
708 Pts Much faster multi-core int speed.
+74%
406 Pts
MC Float
Multi Core Floating Point Speed
750 Pts Much faster multi-core fp speed.
+74%
430 Pts
Series
CPU Architecture
Coffee Lake (2017) Skylake (2015)
Socket
Motherboard Socket
FCLGA1151 FCLGA1151
Graphics
Integrated Graphics
UHD 630 HD 530
Launch Date
Launch Date
Q4'17 Q3'15
Cache
Cache
9 MB 6 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX2 SSE4.1/4.2, AVX 2.0
Embedded Options Available
Embedded Options Available
No Yes
Recommended Price
Recommended Customer Price
N/A $192.00 - $202.00
Memory Types
Memory Types
DDR4-2666 DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 Intel® HD Graphics 530
TSX-NI
Intel® TSX-NI
No Yes
vPro Tech
Intel® vPro™ Technology ‡
No Yes
Stable Image Platform Program (SIPP)
Intel® Stable Image Platform Program (SIPP)
No Yes
Trusted Execution Tech
Intel® Trusted Execution 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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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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