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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

AMD Athlon II X4 645 vs AMD Phenom II X4 820

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 820+ ADD
Price$28.85
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$291
Socket TypeAM3AM3
CPU ClassDesktopDesktop
Clockspeed3.1 GHz2.8 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 2010Q4 2009
# of Samples568217
Cross-Platform Rating46765085
Single Thread Rating12561137
CPU Mark22232108
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 28th of October 2021 - Higher results represent better performance
AMD Athlon II X4 645
2,223
AMD Phenom II X4 820
2,108
CPU Value (CPU Mark / $Price)
As of 28th of October 2021 - Higher results represent better value
AMD Athlon II X4 645
77.05
AMD Phenom II X4 820
72.68
CPU Single Thread Rating
As of 28th of October 2021 - Higher results represent better performance
AMD Athlon II X4 645
1,256
AMD Phenom II X4 820
1,137

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 820
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.