IntelBX80684I58400
IntelBX80677I57600K

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

4 Cores, 4 Threads @3.8GHz, Kaby Lake.
Release date: Q1 2017.

Real World Speed
Performance profile from 160,924 user samples
75,573 User Benchmarks
Best Bench: 94% Base clock 2.8 GHz
Worst Bench: 81% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Poor: 81% Great: 94%
SPEED RANK: 46th / 1147
Gaming
Gaming 89%
Aircraft carrier
Desktop
Desktop 86%
Aircraft carrier
Workstation
Workstation 65%
Destroyer
85,351 User Benchmarks
Best Bench: 110% Base clock 3.8 GHz, turbo 5.25 GHz (avg)
Worst Bench: 74% Base clock 3.8 GHz, turbo 1.95 GHz (avg)
Poor: 74% Great: 110%
SPEED RANK: 42nd / 1147
Gaming
Gaming 91%
Nuclear submarine
Desktop
Desktop 90%
Nuclear submarine
Workstation
Workstation 55%
Gunboat
Effective Speed
Effective CPU Speed
89.1 % 91.5 % +3%
SC Mixed
Avg. Single Core Mixed Speed
117 Pts 128 Pts Slightly faster single-core speed.
+9%
QC Mixed
Avg. Quad Core Mixed Speed
452 Pts 471 Pts +4%
MC Mixed
Avg. Multi Core Mixed Speed
652 Pts Much faster multi-core speed.
+36%
480 Pts
SC Mixed
OC Single Core Mixed Speed
123 Pts 150 Pts Faster OC single-core speed.
+22%
QC Mixed
OC Quad Core Mixed Speed
478 Pts 570 Pts Faster OC quad-core speed.
+19%
MC Mixed
OC Multi Core Mixed Speed
697 Pts Faster OC multi-core speed.
+22%
569 Pts
Market Share
Based on 15,598,472 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.44 % Hugely higher market share.
+129%
0.63 %
Value
Value For Money
106 % Slightly better value.
+9%
96.8 %
User Rating
UBM User Rating
115 % More popular.
+20%
96 %
Price
Price (score)
$185 Cheaper.
+26%
$251
Age
Newest
17 Months Much more recent.
+35%
26 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 3.8 GHz Much faster base frequency.
+36%
Turbo Clock
Turbo Clock Speed
4 GHz 4.2 GHz +5%
SC Int
Single Core Integer Speed
118 Pts 144 Pts Faster single-core int speed.
+22%
SC Float
Single Core Floating Point Speed
128 Pts 156 Pts Faster single-core fp speed.
+22%
QC Int
Quad Core Integer Speed
460 Pts 535 Pts Faster quad-core int speed.
+16%
QC Float
Quad Core Floating Point Speed
499 Pts 614 Pts Faster quad-core fp speed.
+23%
MC Int
Multi Core Integer Speed
668 Pts Faster multi-core int speed.
+23%
542 Pts
MC Float
Multi Core Floating Point Speed
740 Pts Faster multi-core fp speed.
+21%
613 Pts
Series
CPU Architecture
Coffee Lake Kaby Lake
Socket
Motherboard Socket
FCLGA1151 FCLGA1151
Graphics
Integrated Graphics
UHD 630 HD 630
Launch Date
Launch Date
Q4'17 Q1'17
Cache
Cache
9 MB 6 MB
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
Memory Types
Memory Types
DDR4-2666 DDR4-2133/2400, DDR3L-1333/1600 @ 1.35V
Processor Graphics
Processor Graphics ‡
Intel® UHD Graphics 630 Intel® HD Graphics 630
Graphics Base Frequency
Graphics Base Frequency
350 MHz 350.00 MHz
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 i5-7600K targets high end gamers, it sits just behind the flagship i7-7700K in Intel’s Kaby Lake lineup. The 7600K will likely be the most popular gaming CPU of 2017 (some competition from AMD’s upcoming Zen/Ryzen CPUs, would be very welcome). Comparing the 7600K and 6600K shows that the two processors are very closely matched and comparing the 7600K vs the hyper-threaded 7700K highlights the relative strength of the 7700K for workstation performance. There are no significant architectural differences between Kaby Lake and Skylake so, when fully overclocked, the two generations should perform similarly but Kaby Lake offers faster base clocks, improved speed shift technology which helps CPU responsiveness, and better integrated graphics[Jan '17 CPUPro]

MORE DETAILS

Processor Rankings (Price vs Performance) March 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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  • Fastest real world speed - Real World Speed measures performance for typical consumers.
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