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Intel Core2 Extreme Q6800 vs Core2 Quad Q8400

The Intel Core2 Quad Q8400 @ 2.66GHz is newer than Intel Core2 Extreme Q6800 @ 2.93GHz and is around -9% slower in multi-threaded (CPU Mark) testing. However the CPUs have comparable single-thread rating. Also, Intel Core2 Quad Q8400 @ 2.66GHz uses around 24% more power. All the CPUs in this comparison belong in the Desktop CPU Class. The values below were tabulated from a combined 1733 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 Extreme Q6800 @ 2.93GHz×Intel Core2 Quad Q8400 @ 2.66GHz+ ADD
Price Search Online Search Online
Socket TypeLGA775LGA775
CPU ClassDesktopDesktop
Clockspeed2.9 GHz2.7 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores4 (Threads: 4)4 (Threads: 4)
CacheL1: 256KB, L2: 8.0MB, L3: 0MBL1: 256KB, L2: 4.0MB, L3: 0MB
TDP75W95W
Yearly Running Cost$13.69$17.34
Other
First Seen on ChartQ4 2008Q2 2009
# of Samples541679
CPU Rank34383573
CPU Value2.016.2
Single Thread Rating(% diff. to max in group)1158(0.0%)1142(-1.4%)
CPU Mark(% diff. to max in group)2292(0.0%)2083(-9.1%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 17th of March 2026 - Higher results represent better performance
Intel Core2 Extreme Q6800 @ 2.93GHz
2,292
Intel Core2 Quad Q8400 @ 2.66GHz
2,083
PassMark Software © 2008-2026
CPU Value (CPU Mark / $Price)
As of 17th of March 2026 - Higher results represent better value
Intel Core2 Extreme Q6800 @ 2.93GHz
2.0
Intel Core2 Quad Q8400 @ 2.66GHz
16.2
PassMark Software © 2008-2026
CPU Single Thread Rating
As of 17th of March 2026 - Higher results represent better performance
Intel Core2 Extreme Q6800 @ 2.93GHz
1,158
Intel Core2 Quad Q8400 @ 2.66GHz
1,142
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 Extreme Q6800 @ 2.93GHz Intel Core2 Quad Q8400 @ 2.66GHz
Max TDP75W95W
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.