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Intel Core2 Quad Q8400 vs AMD Phenom II X4 955

The Intel Core2 Quad Q8400 @ 2.66GHz is newer than AMD Phenom II X4 955, while AMD Phenom II X4 955 is around 18% faster in multi-threaded (CPU Mark) testing, it is around 12% faster in single-thread testing. However, AMD Phenom II X4 955 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 5672 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 Quad Q8400 @ 2.66GHz×AMD Phenom II X4 955+ ADD
Price Search Online $49.99 - BUY
Socket TypeLGA775AM3
CPU ClassDesktopDesktop
Clockspeed2.7 GHz3.2 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores4 (Threads: 4)4 (Threads: 4)
CacheL1: 256KB, L2: 4.0MB, L3: 0MBL1: 512KB, L2: 2.0MB, L3: 6MB
TDP95W125W
Yearly Running Cost$17.34$22.81
Other
First Seen on ChartQ2 2009Q1 2009
# of Samples16424030
CPU Value16.050.5
Single Thread Rating(% diff. to max in group)1142(-11.8%)1295(0.0%)
CPU Mark(% diff. to max in group)2066(-18.1%)2523(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 30th of December 2024 - Higher results represent better performance
Intel Core2 Quad Q8400 @ 2.66GHz
2,066
AMD Phenom II X4 955
2,523
PassMark Software © 2008-2024
CPU Value (CPU Mark / $Price)
As of 30th of December 2024 - Higher results represent better value
Intel Core2 Quad Q8400 @ 2.66GHz
16.0
AMD Phenom II X4 955
50.5
PassMark Software © 2008-2024
CPU Single Thread Rating
As of 30th of December 2024 - Higher results represent better performance
Intel Core2 Quad Q8400 @ 2.66GHz
1,142
AMD Phenom II X4 955
1,295
PassMark Software © 2008-2024
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 Quad Q8400 @ 2.66GHz AMD Phenom II X4 955
Max TDP95W125W
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.