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AMD Phenom II X2 B57 vs Athlon II X2 255

The AMD Phenom II X2 B57 is newer than AMD Athlon II X2 255 and has comparable multi-threaded (CPU Mark) and single-thread rating. However, AMD Phenom II X2 B57 uses around 21% more power. All the CPUs in this comparison belong in the Desktop CPU Class.The values below were tabulated from a combined 437 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 Phenom II X2 B57×AMD Athlon II X2 255+ ADD
Price Search Online Search Online
Socket TypeNA2AM3
CPU ClassDesktopDesktop
Clockspeed3.2 GHz3.1 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores2 (Threads: 2)2 (Threads: 2)
CacheL1: 256KB, L2: 1.0MB, L3: 6MBL1: 256KB, L2: 2.0MB,
TDP80W65W
Yearly Running Cost$14.60$11.86
Other
First Seen on ChartQ2 2010Q1 2010
# of Samples15422
CPU Value0.095.8
Single Thread Rating(% diff. to max in group)12733(0.0%)12383(-2.8%)
CPU Mark(% diff. to max in group)1260(0.0%)1203(-4.5%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.
2 - Information not available. Do you know? Notify Us.
3 - Single thread rating may be higher than the overall rating, thread performance is just one component of the CPU Mark.

CPU Mark Rating
As of 2nd of April 2025 - Higher results represent better performance
AMD Phenom II X2 B57
1,260
AMD Athlon II X2 255
1,203
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 2nd of April 2025 - Higher results represent better value
AMD Phenom II X2 B57
NA
AMD Athlon II X2 255
95.8
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 2nd of April 2025 - Higher results represent better performance
AMD Phenom II X2 B57
1,273
AMD Athlon II X2 255
1,238
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 Phenom II X2 B57 AMD Athlon II X2 255
Max TDP80W65W
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.