IntelBX80684I58400
IntelBX80677I57600K

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

4 Cores, 4 Threads
@3.8GHz Kaby Lake (2017)

Real World Speed
Performance profile from 75,179 user samples
13,288 User Benchmarks
Best Bench: 95% Base clock 2.8 GHz, turbo 3.85 GHz (avg)
Worst Bench: 86% Base clock 2.8 GHz, turbo 1.6 GHz (avg)
Poor: 86% Great: 95%
SPEED RANK: 30th / 1104
Gaming
Gaming 92%
Nuclear submarine
Desktop
Desktop 88%
Aircraft carrier
Workstation
Workstation 67%
Battle cruiser
61,891 User Benchmarks
Best Bench: 112% Base clock 3.8 GHz, turbo 5.1 GHz (avg)
Worst Bench: 76% Base clock 3.8 GHz, turbo 4 GHz (avg)
Poor: 76% Great: 112%
SPEED RANK: 24th / 1104
Gaming
Gaming 95%
Nuclear submarine
Desktop
Desktop 92%
Nuclear submarine
Workstation
Workstation 57%
Gunboat
Effective Speed
Effective CPU Speed
91.8 % 94.6 % +3%
SC Mixed
Avg. Single Core Mixed Speed
120 Pts 130 Pts Slightly faster single-core speed.
+8%
QC Mixed
Avg. Quad Core Mixed Speed
466 Pts 491 Pts Slightly faster quad-core speed.
+5%
MC Mixed
Avg. Multi Core Mixed Speed
680 Pts Much faster multi-core speed.
+35%
502 Pts
SC Mixed
OC Single Core Mixed Speed
125 Pts 152 Pts Faster OC single-core speed.
+22%
QC Mixed
OC Quad Core Mixed Speed
486 Pts 586 Pts Faster OC quad-core speed.
+21%
MC Mixed
OC Multi Core Mixed Speed
720 Pts Faster OC multi-core speed.
+23%
586 Pts
Market Share
Based on 8,858,113 CPUs tested.
Market Share
Market Share (trailing 30 days)
1.21 % Slightly higher market share.
+10%
1.1 %
Value
Value For Money
110 % +1% 109 %
User Rating
UBM User Rating
102 % Slightly more popular.
+6%
96 %
Price
Price (score)
$179 Slightly cheaper.
+10%
$200
Age
Newest
7 Months Much more recent.
+56%
16 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
122 Pts 147 Pts Faster single-core int speed.
+20%
SC Float
Single Core Floating Point Speed
129 Pts 156 Pts Faster single-core fp speed.
+21%
QC Int
Quad Core Integer Speed
473 Pts 563 Pts Faster quad-core int speed.
+19%
QC Float
Quad Core Floating Point Speed
501 Pts 615 Pts Faster quad-core fp speed.
+23%
MC Int
Multi Core Integer Speed
701 Pts Faster multi-core int speed.
+24%
567 Pts
MC Float
Multi Core Floating Point Speed
744 Pts Faster multi-core fp speed.
+20%
618 Pts
Series
CPU Architecture
Coffee Lake (2017) Kaby Lake (2017)
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]

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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) May 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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CPUGPUSSD
Intel Core i7-8700K $340Nvidia GTX 1070 $447Samsung 850 Evo 250GB $95
AMD Ryzen 5 1600 $170Nvidia GTX 1060-6GB $295Samsung 850 Evo 500GB $137
Intel Core i7-7700K $290AMD RX 480 $330Samsung 850 Pro 256GB $139
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