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Intel Core2 Duo E8400 vs AMD Phenom X3 8550

The AMD Phenom X3 8550 is newer than Intel Core2 Duo E8400 @ 3.00GHz, while the multi-threaded (CPU Mark) is simliar, Intel Core2 Duo E8400 @ 3.00GHz is around 31% faster in single-thread testing. However, AMD Phenom X3 8550 uses around 38% more power. All the CPUs in this comparison belong in the Desktop CPU Class.The values below were tabulated from a combined 7373 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.

×Intel Core2 Duo E8400 @ 3.00GHz×AMD Phenom X3 8550+ ADD
Price Search Online Search Online
Socket TypeLGA775AM2/AM2+
CPU ClassDesktopDesktop
Clockspeed3.0 GHz2.2 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores2 (Threads: 2)3 (Threads: 3)
CacheL1: 128KB, L2: 6.0MB, L3: 0MBL1: 384KB, L2: 1.5MB, L3: 2MB
TDP65W95W
Yearly Running Cost$11.86$17.34
Other
First Seen on ChartQ4 2008Q2 2009
# of Samples729776
CPU Value52.541.1
Single Thread Rating(% diff. to max in group)12333(0.0%)856(-30.6%)
CPU Mark(% diff. to max in group)1210(0.0%)1151(-4.9%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.
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 6th of April 2025 - Higher results represent better performance
Intel Core2 Duo E8400 @ 3.00GHz
1,210
AMD Phenom X3 8550
1,151
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 6th of April 2025 - Higher results represent better value
Intel Core2 Duo E8400 @ 3.00GHz
52.5
AMD Phenom X3 8550
41.1
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 6th of April 2025 - Higher results represent better performance
Intel Core2 Duo E8400 @ 3.00GHz
1,233
AMD Phenom X3 8550
856
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.
Intel Core2 Duo E8400 @ 3.00GHz AMD Phenom X3 8550
Max TDP65W95W
Power consumption per day (kWh)0.130.19
Running cost per day$0.033$0.048
Power consumption per year (kWh)47.569.3
Running cost per year$11.86$17.34
Shown CPU power usage is based on linear interpolation of Max TDP (i.e. max load). Actual CPU power profile may vary.