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

8 Cores, 16 Threads
@3.0GHz Zen (2017)

Real World Speed
Performance profile from 53,028 user samples
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
46,442 User Benchmarks
Best Bench: 98% Base clock 3 GHz, turbo 3.15 GHz (avg)
Worst Bench: 73% Base clock 3.7 GHz, turbo 3.65 GHz (avg)
Poor: 73% Great: 98%
SPEED RANK: 39th / 1052
Gaming 85%
Aircraft carrier
Desktop 82%
Aircraft carrier
Workstation 91%
Nuclear submarine
Effective Speed
Effective CPU Speed
92.6 % Slightly faster effective speed.
84.7 %
SC Mixed
Avg. Single Core Mixed Speed
121 Pts Faster single-core speed.
101 Pts
QC Mixed
Avg. Quad Core Mixed Speed
470 Pts Faster quad-core speed.
393 Pts
MC Mixed
Avg. Multi Core Mixed Speed
686 Pts 1124 Pts Much faster multi-core speed.
SC Mixed
OC Single Core Mixed Speed
126 Pts Slightly faster OC single-core speed.
116 Pts
QC Mixed
OC Quad Core Mixed Speed
488 Pts Slightly faster OC quad-core speed.
460 Pts
MC Mixed
OC Multi Core Mixed Speed
724 Pts 1314 Pts Hugely faster OC multi-core speed.
Market Share
Based on 7,873,973 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.7 % 1.02 % Much higher market share.
Value For Money
111 % Better value.
91.1 %
User Rating
UBM User Rating
113 % Slightly more popular.
107 %
Price (score)
$179 Cheaper.
5 Months Much more recent.
12 Months
Thermal Design Power (TDP)
65 Watts 65 Watts
CPU Processing Cores
6 cores 8 cores Much higher core count.
CPU Processing Threads
6 threads 16 threads Hugely higher thread count.
Manufacturing process
14 nm 14 nm
Base Clock
Base Clock Speed
2.8 GHz 3 GHz Slightly faster base frequency.
Turbo Clock
Turbo Clock Speed
4 GHz Slightly faster turbo frequency.
3.7 GHz
SC Int
Single Core Integer Speed
122 Pts Slightly faster single-core int speed.
111 Pts
SC Float
Single Core Floating Point Speed
129 Pts Slightly faster single-core fp speed.
120 Pts
QC Int
Quad Core Integer Speed
476 Pts Slightly faster quad-core int speed.
444 Pts
QC Float
Quad Core Floating Point Speed
504 Pts Slightly faster quad-core fp speed.
479 Pts
MC Int
Multi Core Integer Speed
703 Pts 1277 Pts Hugely faster multi-core int speed.
MC Float
Multi Core Floating Point Speed
746 Pts 1329 Pts Much faster multi-core fp speed.
CPU Architecture
Coffee Lake (2017) Zen (2017)
Motherboard Socket
Integrated Graphics
UHD 630 None

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]


The AMD Ryzen 7 1700 is the least powerful of three new Ryzen 7 CPUs. The 1700 model has base and turbo clocks of 3.0 and 3.7 GHz respectively. Both of its more expensive siblings, the 1700X and 1800X, have higher clocks but they also have TDPs of 95 watts whereas the 1700 is rated at just 65 watts. Comparing IPC between Ryzen and Kaby Lake shows that Kaby Lake leads by a maximum of 9% which is great news for workstation users as this allows the 1700 to beat Intel's 6850K in multi-core workloads at almost half the price. Although the 1700 has great IPC it's somewhat limited by its relatively low (by Kaby Lake standards) clock speed which holds it back a little in both gaming and desktop workloads. For multi-core workstation use, the Ryzen 7 1700 represents the best value for money we have ever seen. [Mar '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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How it works

  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - 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
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.

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Intel Core i7-8700K $330Nvidia GTX 1070 $447Samsung 850 Evo 250GB $85
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
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $198SanDisk Extreme 64GB $44
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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