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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

AMD Phenom II X4 955 vs Intel Core2 Quad Q8400 @ 2.66GHz

The values for the CPUs below are determined from thousands of PerformanceTest benchmark results and are updated daily.


×AMD Phenom II X4 955×Intel Core2 Quad Q8400 @ 2.66GHz+ ADD
Price$176.181$128.881
Socket TypeAM3LGA775
CPU ClassDesktopDesktop
Clockspeed3.2 GHz2.7 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores4 (Threads: 4)4 (Threads: 4)
Max TDP125W95W
Yearly Running Cost$22.81$17.34
First Seen on ChartQ1 2009Q2 2009
# of Samples38591531
Single Thread Rating(% diff. to max in group)1294(0.0%)1154(-10.9%)
CPU Mark(% diff. to max in group)2431(0.0%)2038(-16.2%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 10th of August 2022 - Higher results represent better performance
AMD Phenom II X4 955
 2,431
Intel Core2 Quad Q8400 @ 2.66GHz
 2,038
PassMark Software © 2008-2022
CPU Value (CPU Mark / $Price)
As of 10th of August 2022 - Higher results represent better value
AMD Phenom II X4 955
 13.80
Intel Core2 Quad Q8400 @ 2.66GHz
 15.82
PassMark Software © 2008-2022
CPU Single Thread Rating
As of 10th of August 2022 - Higher results represent better performance
AMD Phenom II X4 955
 1,294
Intel Core2 Quad Q8400 @ 2.66GHz
 1,154
PassMark Software © 2008-2022

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.
AMD Phenom II X4 955Intel Core2 Quad Q8400 @ 2.66GHz
Max TDP125W95W
Power consumption per day (kWh)NANA
Running cost per dayNANA
Power consumption per year (kWh)NANA
Running cost per yearNANA
Shown CPU power usage is based on linear interpolation of Max TDP (i.e. max load). Actual CPU power profile may vary.