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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$69.95
BUY NOW!		$79.951
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 Samples551671
Cross-Platform Rating43635078
Single Thread Rating12261290
CPU Mark21292319
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 5th of August 2020 - Higher results represent better performance
AMD Athlon II X4 645
 2,129
AMD Phenom II X4 840
 2,319
PassMark Software © 2008-2020
CPU Value (CPU Mark / $Price)
As of 5th of August 2020 - Higher results represent better value
AMD Athlon II X4 645
 30.43
AMD Phenom II X4 840
 29.00
PassMark Software © 2008-2020
CPU Single Thread Rating
As of 5th of August 2020 - Higher results represent better performance
AMD Athlon II X4 645
 1,226
AMD Phenom II X4 840
 1,290
PassMark Software © 2008-2020

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)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.