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Intel Core2 Quad Q9400 vs i7-8700K

The Intel Core i7-8700K @ 3.70GHz is newer than Intel Core2 Quad Q9400 @ 2.66GHz and is significantly faster in multi-threaded (CPU Mark) testing and is significantly 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 17712 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×Intel Core i7-8700K @ 3.70GHz+ ADD
Price Search Online $157.65 - BUY
Socket TypeLGA775FCLGA1151-2
CPU ClassDesktopDesktop
Clockspeed2.7 GHz3.7 GHz
Turbo SpeedNot SupportedUp to 4.7 GHz
# of Physical Cores4 (Threads: 4)6 (Threads: 12)
CacheL1: 256KB, L2: 6.0MB, L3: 0MBL1: 384KB, L2: 1.5MB, L3: 12MB
TDP95W95W
Yearly Running Cost$17.34$17.34
OtherIntel UHD Graphics 630
First Seen on ChartQ4 2008Q4 2017
# of Samples247715235
CPU Value85.486.4
Single Thread Rating(% diff. to max in group)1138(-58.2%)2726(0.0%)
CPU Mark(% diff. to max in group)2138(-84.3%)13617(0.0%)
1 - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 28th of December 2024 - Higher results represent better performance
Intel Core2 Quad Q9400 @ 2.66GHz
2,138
Intel Core i7-8700K @ 3.70GHz
13,617
PassMark Software © 2008-2024
CPU Value (CPU Mark / $Price)
As of 28th of December 2024 - Higher results represent better value
Intel Core2 Quad Q9400 @ 2.66GHz
85.4
Intel Core i7-8700K @ 3.70GHz
86.4
PassMark Software © 2008-2024
CPU Single Thread Rating
As of 28th of December 2024 - Higher results represent better performance
Intel Core2 Quad Q9400 @ 2.66GHz
1,138
Intel Core i7-8700K @ 3.70GHz
2,726
PassMark Software © 2008-2024
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 Intel Core i7-8700K @ 3.70GHz
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.