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Intel Core2 Quad Q8400 vs i5-660

The Intel Core i5-660 @ 3.33GHz is newer than Intel Core2 Quad Q8400 @ 2.66GHz and is around 15% faster in multi-threaded (CPU Mark) testing. The Intel Core i5-660 @ 3.33GHz is around 25% faster in single-thread testing. Also, Intel Core2 Quad Q8400 @ 2.66GHz uses around 26% more power. All the CPUs in this comparison belong in the Desktop CPU Class. The values below were tabulated from a combined 2083 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 Core i5-660 @ 3.33GHz+ ADD
Price Search Online Search Online
Socket TypeLGA775LGA1156
CPU ClassDesktopDesktop
Clockspeed2.7 GHz3.3 GHz
Turbo SpeedNot SupportedUp to 3.6 GHz
# of Physical Cores4 (Threads: 4)2 (Threads: 4)
CacheL1: 256KB, L2: 4.0MB, L3: 0MBL1: 128KB, L2: 0.5MB, L3: 4MB
TDP95W73W
Yearly Running Cost$17.34$13.32
Other
First Seen on ChartQ2 2009Q4 2009
# of Samples1679404
CPU Rank35633362
CPU Value16.216.0
Single Thread Rating(% diff. to max in group)1142(-20.0%)1428(0.0%)
CPU Mark(% diff. to max in group)2083(-13.1%)2397(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 9th of March 2026 - Higher results represent better performance
Intel Core2 Quad Q8400 @ 2.66GHz
2,083
Intel Core i5-660 @ 3.33GHz
2,397
PassMark Software © 2008-2026
CPU Value (CPU Mark / $Price)
As of 9th of March 2026 - Higher results represent better value
Intel Core2 Quad Q8400 @ 2.66GHz
16.2
Intel Core i5-660 @ 3.33GHz
16.0
PassMark Software © 2008-2026
CPU Single Thread Rating
As of 9th of March 2026 - Higher results represent better performance
Intel Core2 Quad Q8400 @ 2.66GHz
1,142
Intel Core i5-660 @ 3.33GHz
1,428
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 Q8400 @ 2.66GHz Intel Core i5-660 @ 3.33GHz
Max TDP95W73W
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.