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Intel Core2 Quad Q9400 vs AMD Phenom II X4 840

The AMD Phenom II X4 840 is newer than Intel Core2 Quad Q9400 @ 2.66GHz and is around 14% faster in multi-threaded (CPU Mark) testing. The AMD Phenom II X4 840 is around 14% faster in single-thread testing. Both CPUs operates at simliar power levels (TDP). All the CPUs in this comparison belong in the Desktop CPU Class. The values below were tabulated from a combined 3305 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 Q9400 @ 2.66GHz×AMD Phenom II X4 840+ ADD
Price Search Online Search Online
Socket TypeLGA775AM2+/AM3
CPU ClassDesktopDesktop
Clockspeed2.7 GHz3.2 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores4 (Threads: 4)4 (Threads: 4)
CacheL1: 256KB, L2: 6.0MB, L3: 0MBL1: 512KB, L2: 2.0MB,
TDP95W95W
Yearly Running Cost$17.34$17.34
Other
First Seen on ChartQ4 2008Q1 2011
# of Samples2568737
CPU Rank34883289
CPU Value86.281.9
Single Thread Rating(% diff. to max in group)1140(-12.4%)1301(0.0%)
CPU Mark(% diff. to max in group)2160(-12.0%)2456(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 8th of February 2026 - Higher results represent better performance
Intel Core2 Quad Q9400 @ 2.66GHz
2,160
AMD Phenom II X4 840
2,456
PassMark Software © 2008-2026
CPU Value (CPU Mark / $Price)
As of 8th of February 2026 - Higher results represent better value
Intel Core2 Quad Q9400 @ 2.66GHz
86.2
AMD Phenom II X4 840
81.9
PassMark Software © 2008-2026
CPU Single Thread Rating
As of 8th of February 2026 - Higher results represent better performance
Intel Core2 Quad Q9400 @ 2.66GHz
1,140
AMD Phenom II X4 840
1,301
PassMark Software © 2008-2026
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 Q9400 @ 2.66GHz AMD Phenom II X4 840
Max TDP95W95W
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.