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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

AMD Athlon II X4 645 vs AMD Phenom II X4 840

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

×AMD Athlon II X4 645×AMD Phenom II X4 840+ ADD
Price$16.48
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$23.98
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Socket TypeAM3AM2+/AM3
CPU ClassDesktopDesktop
Clockspeed3.1 GHz3.2 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores4 (Threads: 4)4 (Threads: 4)
Max TDP95W95W
Yearly Running Cost$17.34$17.34
First Seen on ChartQ4 2010Q1 2011
# of Samples584696
Single Thread Rating12661309
CPU Mark23122355

CPU Mark Rating
As of 26th of May 2022 - Higher results represent better performance
AMD Athlon II X4 645
2,312
AMD Phenom II X4 840
2,355
CPU Value (CPU Mark / $Price)
As of 26th of May 2022 - Higher results represent better value
AMD Athlon II X4 645
140.27
AMD Phenom II X4 840
98.20
CPU Single Thread Rating
As of 26th of May 2022 - Higher results represent better performance
AMD Athlon II X4 645
1,266
AMD Phenom II X4 840
1,309

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 Athlon II X4 645AMD Phenom II X4 840
Max TDP95W95W
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.