IntelBX80684I58400
IntelBX80662I56600K

6 Cores, 6 Threads @2.8GHz, Coffee Lake.
Release date: Q4 2017.

4 Cores, 4 Threads @3.5GHz, Skylake.
Release date: Q3 2015.

Real World Speed
Performance profile from 253,364 user samples
78,686 User Benchmarks
Best Bench: 94% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 82% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Poor: 82% Great: 94%
SPEED RANK: 46th / 1147
Gaming
Gaming 89%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 65%
Destroyer
174,678 User Benchmarks
Best Bench: 103% Base clock 3.5 GHz, turbo 4.8 GHz (avg)
Worst Bench: 63% Base clock 3.5 GHz, turbo 1.75 GHz (avg)
Poor: 63% Great: 103%
SPEED RANK: 61st / 1147
Gaming
Gaming 84%
Aircraft carrier
Desktop
Desktop 83%
Aircraft carrier
Workstation
Workstation 51%
Yacht
Effective Speed
Effective CPU Speed
89.3 % Slightly faster effective speed.
+6%
84.2 %
SC Mixed
Avg. Single Core Mixed Speed
117 Pts 118 Pts +1%
QC Mixed
Avg. Quad Core Mixed Speed
453 Pts +5% 433 Pts
MC Mixed
Avg. Multi Core Mixed Speed
654 Pts Much faster multi-core speed.
+46%
448 Pts
SC Mixed
OC Single Core Mixed Speed
123 Pts 141 Pts Slightly faster OC single-core speed.
+15%
QC Mixed
OC Quad Core Mixed Speed
477 Pts 539 Pts Slightly faster OC quad-core speed.
+13%
MC Mixed
OC Multi Core Mixed Speed
699 Pts Faster OC multi-core speed.
+28%
547 Pts
Market Share
Based on 16,365,793 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.42 % Much higher market share.
+42%
1 %
Value
Value For Money
103 % Slightly better value.
+13%
91.3 %
User Rating
UBM User Rating
117 % Much more popular.
+43%
82 %
Price
Price (score)
$199 Cheaper.
+15%
$235
Age
Newest
18 Months Much more recent.
+59%
44 Months
TDP
Thermal Design Power (TDP)
65 Watts More energy efficient.
+29%
91 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 3.5 GHz Faster base frequency.
+25%
Turbo Clock
Turbo Clock Speed
4 GHz +3% 3.9 GHz
SC Int
Single Core Integer Speed
118 Pts 136 Pts Faster single-core int speed.
+15%
SC Float
Single Core Floating Point Speed
128 Pts 148 Pts Faster single-core fp speed.
+16%
QC Int
Quad Core Integer Speed
460 Pts 511 Pts Slightly faster quad-core int speed.
+11%
QC Float
Quad Core Floating Point Speed
498 Pts 579 Pts Faster quad-core fp speed.
+16%
MC Int
Multi Core Integer Speed
669 Pts Faster multi-core int speed.
+30%
515 Pts
MC Float
Multi Core Floating Point Speed
738 Pts Faster multi-core fp speed.
+27%
579 Pts
Series
CPU Architecture
Coffee Lake Skylake
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
Recommended Price
Recommended Customer Price
N/A $242.00 - $243.00
Thermal Solution Specification
Thermal Solution Specification
PCG 2015C (65W) PCG 2015D (130W)
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
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.05 GHz 1.15 GHz
TSX-NI
Intel® TSX-NI
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]

MORE DETAILS

The Intel Core i5-6600K is based on the new "Skylake" 14nm manufacturing process. Sporting 4 physical cores with base/turbo clocks of 3.5/3.9 GHz the 6600K and its predecessor, the 4690K share the same basic configuration and disappointingly, offer similar performance. Comparing the 6600K and 6700K shows that the 6700K has faster multi and single core performance. The improved multi core performance is due to Hyperthreading which is the key differentiator for the i7-6700K. The gap in single core performance can largely be eliminated by overclocking the i5-6600K so although the stock effective speed is significantly higher on the 6700K, this gap diminishes significantly when both processors are overclocked. At a 30% discount, the 6600K is the better value gaming CPU. [Aug '15 CPUPro]

MORE DETAILS

Processor Rankings (Price vs Performance) April 2019 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

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  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
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