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Intel Core2 Quad Q8400 vs i3-2120

The Intel Core i3-2120 @ 3.30GHz is newer than Intel Core2 Quad Q8400 @ 2.66GHz and is around -5% slower in multi-threaded (CPU Mark) testing. The Intel Core i3-2120 @ 3.30GHz is around 32% faster in single-thread testing. Also, Intel Core2 Quad Q8400 @ 2.66GHz uses around 38% more power. All the CPUs in this comparison belong in the Desktop CPU Class. The values below were tabulated from a combined 6943 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 i3-2120 @ 3.30GHz+ ADD
Price Search Online $102 - BUY
Socket TypeLGA775LGA1155
CPU ClassDesktopDesktop
Clockspeed2.7 GHz3.3 GHz
Turbo SpeedNot SupportedNot Supported
# of Physical Cores4 (Threads: 4)2 (Threads: 4)
CacheL1: 256KB, L2: 4.0MB, L3: 0MBL1: 128KB, L2: 0.5MB, L3: 3MB
TDP95W65W
Yearly Running Cost$17.34$11.86
Other
First Seen on ChartQ2 2009Q1 2011
# of Samples16795264
CPU Rank35623635
CPU Value16.219.4
Single Thread Rating(% diff. to max in group)1142(-24.2%)1507(0.0%)
CPU Mark(% diff. to max in group)2083(0.0%)1978(-5.1%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 7th of March 2026 - Higher results represent better performance
Intel Core2 Quad Q8400 @ 2.66GHz
2,083
Intel Core i3-2120 @ 3.30GHz
1,978
PassMark Software © 2008-2026
CPU Value (CPU Mark / $Price)
As of 7th of March 2026 - Higher results represent better value
Intel Core2 Quad Q8400 @ 2.66GHz
16.2
Intel Core i3-2120 @ 3.30GHz
19.4
PassMark Software © 2008-2026
CPU Single Thread Rating
As of 7th of March 2026 - Higher results represent better performance
Intel Core2 Quad Q8400 @ 2.66GHz
1,142
Intel Core i3-2120 @ 3.30GHz
1,507
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 i3-2120 @ 3.30GHz
Max TDP95W65W
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.