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

4 Cores, 4 Threads @3.1GHz, Sandy Bridge.
Release date: Q1 2011.

Real World Speed
Performance profile from 102,271 user samples
39,006 User Benchmarks
Best Bench: 26% Base clock 3.6 GHz, turbo 3.35 GHz (avg)
Worst Bench: 17% Base clock 3 GHz, turbo 1.1 GHz (avg)
Poor: 17% Great: 26%
SPEED RANK: 795th / 1159
Gaming 24%
Desktop 31%
Sail boat
Workstation 14%
Tree trunk
63,265 User Benchmarks
Best Bench: 65% Base clock 3.1 GHz, turbo 3.6 GHz (avg)
Worst Bench: 46% Base clock 3.1 GHz, turbo 0.95 GHz (avg)
Poor: 46% Great: 65%
SPEED RANK: 259th / 1159
Gaming 59%
Desktop 59%
Workstation 36%
Jet ski
Effective Speed
Effective CPU Speed
24.1 % 59.4 % Hugely faster effective speed.
SC Mixed
Avg. Single Core Mixed Speed
50.4 Pts 83.6 Pts Much faster single-core speed.
QC Mixed
Avg. Quad Core Mixed Speed
97.1 Pts 305 Pts Hugely faster quad-core speed.
MC Mixed
Avg. Multi Core Mixed Speed
99 Pts 313 Pts Hugely faster multi-core speed.
SC Mixed
OC Single Core Mixed Speed
54.7 Pts 88.9 Pts Much faster OC single-core speed.
QC Mixed
OC Quad Core Mixed Speed
109 Pts 337 Pts Hugely faster OC quad-core speed.
MC Mixed
OC Multi Core Mixed Speed
109 Pts 340 Pts Hugely faster OC multi-core speed.
Market Share
Based on 17,684,988 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.24 % 0.71 % Hugely higher market share.
Value For Money
65.8 % 84.8 % Better value.
User Rating
UBM User Rating
56 % 66 % More popular.
Price (score)
$20 Hugely cheaper.
137 Months 101 Months More recent.
Thermal Design Power (TDP)
130 Watts 95 Watts More energy efficient.
CPU Processing Cores
2 cores 4 cores Hugely higher core count.
CPU Processing Threads
2 threads 4 threads Hugely higher thread count.
Manufacturing process
45 nm 32 nm Newer manufacturing.
Base Clock
Base Clock Speed
3 GHz 3.1 GHz +3%
Turbo Clock
Turbo Clock Speed
3 GHz 3.4 GHz Slightly faster turbo frequency.
SC Int
Single Core Integer Speed
74 Pts 88.5 Pts Faster single-core int speed.
SC Float
Single Core Floating Point Speed
43.3 Pts 89.3 Pts Hugely faster single-core fp speed.
QC Int
Quad Core Integer Speed
147 Pts 338 Pts Hugely faster quad-core int speed.
QC Float
Quad Core Floating Point Speed
86.1 Pts 339 Pts Hugely faster quad-core fp speed.
MC Int
Multi Core Integer Speed
149 Pts 338 Pts Hugely faster multi-core int speed.
MC Float
Multi Core Floating Point Speed
86.2 Pts 339 Pts Hugely faster multi-core fp speed.
CPU Architecture
Core Sandy Bridge
Motherboard Socket
LGA775 LGA1155
Integrated Graphics
None HD 2000
Launch Date
Launch Date
Q1'08 Q1'11
6 MB L2 6 MB SmartCache
45 nm 32 nm
Recommended Price
Recommended Customer Price
$149.00 - $179.00 $178.00
Bus Speed
Bus Speed
1333 MHz FSB 5 GT/s DMI
Turbo Boost Tech
Intel® Turbo Boost Technology
No 2.0
AES New Instructions
Intel® AES New Instructions
No Yes

More specs » More specs »

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]


Pros: Brilliant value for money. Cons: It's not the 2400k which can be had for just a tiny bit more and offers a lot more flexibility in terms of overclocking. [Apr '12 CPUPro]


Processor Rankings (Price vs Performance) June 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]


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.

 Frequently Asked Questions

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