IntelBX80684I58400
IntelBX80662I36100

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

2 Cores, 4 Threads
@3.7GHz Skylake (2015)

Real World Speed
Performance profile from 59,447 user samples
22,390 User Benchmarks
Best Bench: 94% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 78% Base clock 2.8 GHz, turbo 1.4 GHz (avg)
Poor: 78% Great: 94%
SPEED RANK: 32nd / 1117
Gaming
Gaming 90%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 65%
Battle cruiser
37,057 User Benchmarks
Best Bench: 67% Base clock 2.8 GHz, turbo 3.7 GHz (avg)
Worst Bench: 49% Base clock 3.7 GHz, turbo 3.7 GHz (avg)
Poor: 49% Great: 67%
SPEED RANK: 214th / 1117
Gaming
Gaming 61%
Destroyer
Desktop
Desktop 68%
Battle cruiser
Workstation
Workstation 36%
Jet ski
Effective Speed
Effective CPU Speed
89.6 % Much faster effective speed.
+47%
61.1 %
SC Mixed
Avg. Single Core Mixed Speed
117 Pts Slightly faster single-core speed.
+11%
105 Pts
QC Mixed
Avg. Quad Core Mixed Speed
455 Pts Much faster quad-core speed.
+61%
283 Pts
MC Mixed
Avg. Multi Core Mixed Speed
662 Pts Hugely faster multi-core speed.
+127%
291 Pts
SC Mixed
OC Single Core Mixed Speed
123 Pts Slightly faster OC single-core speed.
+8%
114 Pts
QC Mixed
OC Quad Core Mixed Speed
479 Pts Much faster OC quad-core speed.
+54%
312 Pts
MC Mixed
OC Multi Core Mixed Speed
708 Pts Hugely faster OC multi-core speed.
+125%
314 Pts
Market Share
Based on 9,825,748 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.51 % Hugely higher market share.
+260%
0.42 %
Value
Value For Money
108 % Better value.
+24%
86.6 %
User Rating
UBM User Rating
107 % Much more popular.
+73%
62 %
Price
Price (score)
$179 $115 Much cheaper.
+36%
Age
Newest
9 Months Much more recent.
+73%
33 Months
TDP
Thermal Design Power (TDP)
65 Watts 47 Watts More energy efficient.
+28%
Cores
CPU Processing Cores
6 cores Hugely higher core count.
+200%
2 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 3.7 GHz Much faster base frequency.
+32%
Turbo Clock
Turbo Clock Speed
4 GHz Slightly faster turbo frequency.
+8%
3.7 GHz
SC Int
Single Core Integer Speed
119 Pts Slightly faster single-core int speed.
+7%
111 Pts
SC Float
Single Core Floating Point Speed
129 Pts Slightly faster single-core fp speed.
+9%
118 Pts
QC Int
Quad Core Integer Speed
462 Pts Much faster quad-core int speed.
+60%
288 Pts
QC Float
Quad Core Floating Point Speed
502 Pts Much faster quad-core fp speed.
+53%
328 Pts
MC Int
Multi Core Integer Speed
682 Pts Hugely faster multi-core int speed.
+136%
289 Pts
MC Float
Multi Core Floating Point Speed
740 Pts Hugely faster multi-core fp speed.
+125%
329 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 3 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 $117.00
Memory Types
Memory Types
DDR4-2666 DDR4-1866/2133, DDR3L-1333/1600 @ 1.35V
ECC Memory Supported
ECC Memory Supported ‡
No Yes
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 Intel® HD Graphics 530
Turbo Boost Tech
Intel® Turbo Boost Technology
2.0 No
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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Processor Rankings (Price vs Performance) July 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.
  • 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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