2 Cores, 2 Threads @3.0GHz, Core.
Release date: Q1 2008.


Release date ≤ Q4 2013.

Real World Speed
Performance profile from 54,834 user samples
43,025 User Benchmarks
Best Bench: 19% Base clock 3 GHz
Worst Bench: 12% Base clock 3 GHz
Poor: 12% Great: 19%
SPEED RANK: 842nd / 1182
Gaming 17%
Desktop 31%
Sail boat
Workstation 11%
Tree trunk
11,809 User Benchmarks
Best Bench: 20% Base clock 3.75 GHz
Worst Bench: 11% Base clock 3 GHz, turbo 3 GHz (avg)
Poor: 11% Great: 20%
SPEED RANK: 835th / 1182
Gaming 17%
Desktop 31%
Sail boat
Workstation 11%
Tree trunk
Effective Speed
Effective CPU Speed
17.2 % 17.4 % +1%
Avg. Single Core Mixed Speed
50.1 Pts 50.8 Pts +1%
Avg. Dual Core Mixed Speed
95.8 Pts 96 Pts +0%
Avg. Quad Core Mixed Speed
96.9 Pts 98.2 Pts +1%
Avg. Octa Core Mixed Speed
99.1 Pts 100 Pts +1%
Avg. Multi Core Mixed Speed
99.7 Pts 102 Pts +2%
OC Single Core Mixed Speed
54.7 Pts 58.1 Pts Slightly faster OC single-core speed.
OC Dual Core Mixed Speed
109 Pts 112 Pts +3%
OC Quad Core Mixed Speed
109 Pts 112 Pts +3%
OC Octa Core Mixed Speed
109 Pts 113 Pts +4%
OC Multi Core Mixed Speed
109 Pts 114 Pts +5%
Market Share
Based on 20,309,735 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.25 % Hugely higher market share.
0.08 %
User Rating
UBM User Rating
59 % Slightly more popular.
54 %
140 Months 69+ Months Much more recent.

The Intel Core 2 Duo E8400 is amongst the fastest of the Core 2 Duo range of now nearly ten year old CPUs. The E8400 is included in our group tests simply as a reference point due to its huge success back in its day. Running at a clock speed of 3.0 GHz the E8400 has an effective speed of 52 which is 85% slower than its modern day counterparts. The relative lack of performance is especially noticeable in the area of multi-core processing as a consequence of the E8400's relatively few two cores. Anyone considering an upgrade needn't hesitate as modern CPUs are not only orders of magnitude faster but also considerably more energy efficient and feature packed. [Oct '14 CPUPro]


Processor Rankings (Price vs Performance) September 2019 CPU Rankings.

We calculate effective speed which measures real world performance for typical gamers and desktop users. 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.
  • 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.
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.
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write, sustained write and mixed IO.
  • - 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 current market leaders.
  • - Explore your best upgrade options with a virtual PC build.
  • - Compare your in-game FPS to other users with your hardware.
  • - Share your opinion by voting.

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Intel Core i5-9600K $225Nvidia GTX 1660-Ti $275Samsung 850 Evo 500GB $90
AMD Ryzen 5 3600 $195Nvidia RTX 2060S (Super) $429Samsung 850 Pro 256GB $230
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3000 C15 2x8GB $70SanDisk Extreme 64GB $88
WD Blue 1TB (2012) $37G.SKILL Trident Z DDR4 3200 C14 4x16GB $799SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $64Corsair Vengeance LPX DDR4 3200 C16 2x8GB $73SanDisk Extreme 16GB $24
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