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CPU Benchmarks

Over 1,000,000 CPUs benchmarked

Intel Core2 Quad Q8400 vs Core2 Quad Q6600

The Intel Core2 Quad Q8400 @ 2.66GHz is newer than Intel Core2 Quad Q6600 @ 2.40GHz also around 11% faster in multi-threaded (CPU Mark) testing, it is around 16% faster in single-thread testing. However, Intel Core2 Quad Q6600 @ 2.40GHz uses around 10% more power. All the CPUs in this comparison belong in the Desktop CPU Class.The values below were tabulated from a combined 9182 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×Intel Core2 Quad Q6600 @ 2.40GHz+ ADD
Price Search Online Search Online
Socket TypeLGA775LGA775
CPU ClassDesktopDesktop
Clockspeed2.7 GHz2.4 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores4 (Threads: 4)4 (Threads: 4)
CacheL1: 256KB, L2: 4.0MB, L3: 0MBL1: 256KB, L2: 8.0MB, L3: 0MB
TDP95W105W
Yearly Running Cost$17.34$19.16
Other
First Seen on ChartQ2 2009Q4 2008
# of Samples16507532
CPU Value16.138.2
Single Thread Rating(% diff. to max in group)1141(0.0%)953(-16.5%)
CPU Mark(% diff. to max in group)2069(0.0%)1832(-11.5%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 14th of March 2025 - Higher results represent better performance
Intel Core2 Quad Q8400 @ 2.66GHz
2,069
Intel Core2 Quad Q6600 @ 2.40GHz
1,832
PassMark Software © 2008-2025
CPU Value (CPU Mark / $Price)
As of 14th of March 2025 - Higher results represent better value
Intel Core2 Quad Q8400 @ 2.66GHz
16.1
Intel Core2 Quad Q6600 @ 2.40GHz
38.2
PassMark Software © 2008-2025
CPU Single Thread Rating
As of 14th of March 2025 - Higher results represent better performance
Intel Core2 Quad Q8400 @ 2.66GHz
1,141
Intel Core2 Quad Q6600 @ 2.40GHz
953
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 Quad Q8400 @ 2.66GHz Intel Core2 Quad Q6600 @ 2.40GHz
Max TDP95W105W
Power consumption per day (kWh)0.190.21
Running cost per day$0.048$0.052
Power consumption per year (kWh)69.376.6
Running cost per year$17.34$19.16
Shown CPU power usage is based on linear interpolation of Max TDP (i.e. max load). Actual CPU power profile may vary.