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CPU Benchmarks

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AMD Athlon II X4 645 vs Phenom II X4 975

The AMD Phenom II X4 975 is newer than AMD Athlon II X4 645 also around 9% faster in multi-threaded (CPU Mark) testing, it is around 6% faster in single-thread testing. However, AMD Phenom II X4 975 uses around 27% more power. All the CPUs in this comparison belong in the Desktop CPU Class.The values below were tabulated from a combined 828 benchmarks submitted from our PerformanceTest software and results and are updated daily to include new submissions.

  • The first section will show basic information for each CPU selected.
  • The additional graphs shows the CPU Mark and Single Thread values of each CPU selected.
  • An accompany graph, if price data is available, will shows the value for money, in terms of the CPU Mark/Thread Rating per dollar.
  • The last section will show approximate yearly running costs for the CPUs.

×AMD Athlon II X4 645×AMD Phenom II X4 975+ ADD
Price $59.99 - BUY Search Online
Socket TypeAM3AM3
CPU ClassDesktopDesktop
Clockspeed3.1 GHz3.6 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores4 (Threads: 4)4 (Threads: 4)
CacheL1: 512KB, L2: 2.0MB, L1: 512KB, L2: 2.0MB, L3: 6MB
TDP95W125W
Yearly Running Cost$17.34$22.81
Other
First Seen on ChartQ4 2010Q1 2011
# of Samples621207
CPU Value39.637.3
Single Thread Rating(% diff. to max in group)1259(-6.3%)1344(0.0%)
CPU Mark(% diff. to max in group)2373(-9.1%)2610(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 7th of April 2025 - Higher results represent better performance
AMD Athlon II X4 645
2,373
AMD Phenom II X4 975
2,610
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 7th of April 2025 - Higher results represent better value
AMD Athlon II X4 645
39.6
AMD Phenom II X4 975
37.3
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 7th of April 2025 - Higher results represent better performance
AMD Athlon II X4 645
1,259
AMD Phenom II X4 975
1,344
PassMark Software © 2008-2025
Estimated Energy Usage Cost
Estimated Energy Adjustable Values
Average hours of use per day Average CPU Utilization (0-100%)1 Power cost, $ per kWh2
8
25
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 645 AMD Phenom II X4 975
Max TDP95W125W
Power consumption per day (kWh)0.190.25
Running cost per day$0.048$0.063
Power consumption per year (kWh)69.391.3
Running cost per year$17.34$22.81
Shown CPU power usage is based on linear interpolation of Max TDP (i.e. max load). Actual CPU power profile may vary.