4 Cores, 8 Threads
@4.2GHz Kaby Lake (2017)

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

Real World Speed
Performance profile from 141,944 user samples
135,358 User Benchmarks
Best Bench: 113% Base clock 4.2 GHz, turbo 5.1 GHz (avg)
Worst Bench: 86% Base clock 4.2 GHz, turbo 2.35 GHz (avg)
Poor: 86% Great: 113%
SPEED RANK: 15th / 1052
Gaming 99%
Nuclear submarine
Desktop 100%
Nuclear submarine
Workstation 73%
6,586 User Benchmarks
Best Bench: 96% Base clock 2.8 GHz, turbo 3.8 GHz (avg)
Worst Bench: 87% Base clock 2.8 GHz, turbo 1.4 GHz (avg)
Poor: 87% Great: 96%
SPEED RANK: 25th / 1052
Gaming 92%
Nuclear submarine
Desktop 89%
Aircraft carrier
Workstation 67%
Battle cruiser
Effective Speed
Effective CPU Speed
99.2 % Slightly faster effective speed.
92.6 %
SC Mixed
Avg. Single Core Mixed Speed
139 Pts Slightly faster single-core speed.
121 Pts
QC Mixed
Avg. Quad Core Mixed Speed
487 Pts +4% 470 Pts
MC Mixed
Avg. Multi Core Mixed Speed
737 Pts Slightly faster multi-core speed.
686 Pts
SC Mixed
OC Single Core Mixed Speed
154 Pts Faster OC single-core speed.
126 Pts
QC Mixed
OC Quad Core Mixed Speed
570 Pts Faster OC quad-core speed.
488 Pts
MC Mixed
OC Multi Core Mixed Speed
821 Pts Slightly faster OC multi-core speed.
724 Pts
Market Share
Based on 7,873,973 CPUs tested.
Market Share
Market Share (trailing 30 days)
2.65 % Hugely higher market share.
0.7 %
Value For Money
99.4 % 111 % Slightly better value.
User Rating
UBM User Rating
133 % More popular.
113 %
Price (score)
$290 $179 Much cheaper.
14 Months 5 Months Much more recent.
Thermal Design Power (TDP)
91 Watts 65 Watts More energy efficient.
CPU Processing Cores
4 cores 6 cores Much higher core count.
CPU Processing Threads
8 threads Much higher thread count.
6 threads
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
4.2 GHz Much faster base frequency.
2.8 GHz
Turbo Clock
Turbo Clock Speed
4.5 GHz Slightly faster turbo frequency.
4 GHz
SC Int
Single Core Integer Speed
152 Pts Faster single-core int speed.
122 Pts
SC Float
Single Core Floating Point Speed
158 Pts Faster single-core fp speed.
129 Pts
QC Int
Quad Core Integer Speed
556 Pts Faster quad-core int speed.
476 Pts
QC Float
Quad Core Floating Point Speed
588 Pts Faster quad-core fp speed.
504 Pts
MC Int
Multi Core Integer Speed
761 Pts Slightly faster multi-core int speed.
703 Pts
MC Float
Multi Core Floating Point Speed
869 Pts Faster multi-core fp speed.
746 Pts
CPU Architecture
Kaby Lake (2017) Coffee Lake (2017)
Motherboard Socket
Integrated Graphics
HD 630 UHD 630
Launch Date
Launch Date
Q1'17 Q4'17
8 MB 9 MB
Instruction Set Extensions
Instruction Set Extensions
SSE4.1/4.2, AVX 2.0 SSE4.1/4.2, AVX2
Recommended Price
Recommended Customer Price
$339.00 - $350.00 N/A
Thermal Solution Specification
Thermal Solution Specification
PCG 2015D (130W) PCG 2015C (65W)
Memory Types
Memory Types
DDR4-2133/2400, DDR3L-1333/1600 @ 1.35V DDR4-2666
Processor Graphics
Processor Graphics ‡
Intel® HD Graphics 630 Intel® UHD Graphics 630
Graphics Base Frequency
Graphics Base Frequency
350.00 MHz 350 MHz
Graphics Max Dynamic Frequency
Graphics Max Dynamic Frequency
1.15 GHz 1.05 GHz
Hyper-Threading Tech
Intel® Hyper-Threading Technology ‡
Yes No
Intel® TSX-NI
Yes No
PCI Express Configurations
PCI Express Configurations ‡
Up to 1x16, 2x8, 1x8+2x4 Up to 1x16 or 2x8 or 1x8+2x4

More specs » More specs »

The Core i7-7700K is Intel’s flagship Kaby Lake based CPU which is reported to have the same IPC as its predecessor, Skylake. Comparing the 7700K and 6700K shows that both average effective speed and peak overclocked speed are up by 7%. Most of the increase in average effective speed is explained by the 5% boost in base clocks from 4.0 to 4.2 GHz. The improved peak lab speed is attributable to a combination of better overclocking capacity and improvements in Intel’s speedshift technology which make the 7700K slightly more responsive. Kaby Lake also has marginally better HD 630 integrated graphics. The i7-7700K is priced similarly to the i7-6700K so for top end gaming and workstation builds, the 7700K is the clear choice for 2017. AMD’s Ryzen will release later this year so things could change at that time. [Jan '17 CPUPro]


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]


Processor Rankings (Price vs Performance) March 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]


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.
How Fast Is Your CPU? (Bench your build) Size up your PC in less than a minute.

Welcome to our freeware PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best upgrades.

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  • - CPU tests include: integer, floating and string.
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  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on
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  • - See speed test results from other users.
  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
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Intel Core i7-7700K $290Nvidia GTX 1060-6GB $335Samsung 850 Evo 500GB $139
AMD Ryzen 5 1600 $189AMD RX 480 $400Samsung 850 Pro 256GB $140
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Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $931SanDisk Extreme 32GB $23
Seagate Barracuda 7200.14 1TB $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $205SanDisk Extreme 16GB $18
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