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CPU Benchmarks

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AMD Athlon II X4 555 vs Phenom II X4 840T

The AMD Athlon II X4 555 is newer than AMD Phenom II X4 840T and is around 7% faster in multi-threaded (CPU Mark) testing. However the CPUs have comparable single-thread rating. All the CPUs in this comparison belong in the Desktop CPU Class. The values below were tabulated from a combined 186 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 555×AMD Phenom II X4 840T+ ADD
Price Search Online Search Online
Socket TypeNA2AM2+/AM3
CPU ClassDesktopDesktop
Clockspeed3.2 GHz2.9 GHz
Turbo SpeedNot SupportedUp to 3.2 GHz
# of Physical Cores4 (Threads: 4)4 (Threads: 4)
CacheL1: 512KB, L2: 2.0MB, L3: 6MBL1: 512KB, L2: 2.0MB, L3: 6MB
TDPNA295W
Yearly Running CostNA$17.34
Other
First Seen on ChartQ4 2010Q4 2010
# of Samples27159
CPU Value0.040.8
Single Thread Rating(% diff. to max in group)1245(-2.2%)1273(0.0%)
CPU Mark(% diff. to max in group)2526(0.0%)2367(-6.3%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.
2 - Information not available. Do you know? Notify Us.

CPU Mark Rating
As of 13th of December 2025 - Higher results represent better performance
AMD Athlon II X4 555
2,526
AMD Phenom II X4 840T
2,367
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 13th of December 2025 - Higher results represent better value
AMD Athlon II X4 555
NA
AMD Phenom II X4 840T
40.8
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 13th of December 2025 - Higher results represent better performance
AMD Athlon II X4 555
1,245
AMD Phenom II X4 840T
1,273
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 555 AMD Phenom II X4 840T
Max TDPNA95W
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.