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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

CPU Performance Comparison

Performance of selected CPUs can be found below. The values for the CPU are determined from thousands of PerformanceTest benchmark results and is updated daily.


×Intel Core2 Quad Q8400 @ 2.66GHz×AMD Phenom II X4 945+ ADD
Price$239.951$64.95 BUY NOW!
Socket TypeLGA775AM3
CPU ClassDesktopDesktop
Clockspeed2.7 GHz3.0 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores44
Max TDP95W125W
Yearly Running Cost$17.34$22.81
First Seen on ChartQ2 2009Q2 2009
# of Samples13631425
Single Thread Rating11201037
CPU Mark31613653

CPU Mark Rating
As of 17th of November 2019 - Higher results represent better performance
Intel Core2 Quad Q8400 @ 2.66GHz
 3,161
AMD Phenom II X4 945
 3,653
PassMark Software © 2008-2019
CPU Value (CPU Mark / $Price)
As of 17th of November 2019 - Higher results represent better value
Intel Core2 Quad Q8400 @ 2.66GHz
 13.18
AMD Phenom II X4 945
 56.24
PassMark Software © 2008-2019
CPU Single Thread Rating
As of 17th of November 2019 - Higher results represent better performance
Intel Core2 Quad Q8400 @ 2.66GHz
 1,120
AMD Phenom II X4 945
 1,037
PassMark Software © 2008-2019

Estimated Energy Usage Cost
Estimated Energy Adjustable Values
Average hours of use per dayAverage CPU Utilization (0-100%)1Power cost, $ per kWh2
1Average user usage is typically low and can vary from task to task. An estimate load 25% is nominal.
2Typical power costs vary around the world. Check your last power bill for details. Values of $0.15 to $0.45 per kWh are typical.
Intel Core2 Quad Q8400 @ 2.66GHzAMD Phenom II X4 945
Max TDP95W125W
Power consumption per day (kWh)abcabc
Running cost per dayabcabc
Power consumption per year (kWh)abcabc
Running cost per yearabcabc
Shown CPU power usage is based on linear interpolation of Max TDP (i.e. max load). Actual CPU power profile may vary.