CPU Performance Comparison

Performance of selected CPUs can be found below. The values for the CPU are determined from thousands of PerformanceTest benchmark results and is updated daily.

	AMD Phenom II X4 955	Intel Core2 Quad Q8400 @ 2.66GHz
Price	$130.16¹	$239.95¹
Socket Type	AM3	LGA775
CPU Class	Desktop	Desktop
Clockspeed	3.2 GHz	2.7 GHz
Turbo Speed	Not Supported	Not Supported
# of Physical Cores	4	4
Max TDP	125W	95W
Yearly Running Cost	$22.81	$17.34
First Seen on Chart	Q1 2009	Q2 2009
# of Samples	3547	1354
Single Thread Rating	1108	1120
CPU Mark	3919	3161

¹ - Last seen price from our affiliates NewEgg.com & Amazon.com.

CPU Mark Rating
As of 20th of September 2019 - Higher results represent better performance
AMD Phenom II X4 955	3,919
Intel Core2 Quad Q8400 @ 2.66GHz	3,161
Intel Core i9-9900K @ 3.60GHz	20,194
Intel Core i7-9700K @ 3.60GHz	17,183
AMD Ryzen 7 2700X	16,979
Intel Core i7-8700K @ 3.70GHz	15,930
Intel Core i7-8700 @ 3.20GHz	15,143
PassMark Software © 2008-2019

CPU Value (CPU Mark / $Price)
As of 20th of September 2019 - Higher results represent better value
AMD Phenom II X4 955	30.11
Intel Core2 Quad Q8400 @ 2.66GHz	13.17
Intel Core i9-9900K @ 3.60GHz	40.80
Intel Core i7-9700K @ 3.60GHz	47.08
AMD Ryzen 7 2700X	85.76
Intel Core i7-8700K @ 3.70GHz	45.52
Intel Core i7-8700 @ 3.20GHz	41.05
PassMark Software © 2008-2019

CPU Single Thread Rating
As of 20th of September 2019 - Higher results represent better performance
AMD Phenom II X4 955	1,108
Intel Core2 Quad Q8400 @ 2.66GHz	1,120
Intel Core i9-9900K @ 3.60GHz	2,895
Intel Core i7-9700K @ 3.60GHz	2,819
AMD Ryzen 7 2700X	2,185
Intel Core i7-8700K @ 3.70GHz	2,698
Intel Core i7-8700 @ 3.20GHz	2,628
PassMark Software © 2008-2019

Show other common CPUs in charts

Estimated Energy Usage Cost

Estimated Energy Adjustable Values
Average hours of use per day
Average CPU Utilization (0-100%)¹
Power cost, $ per kWh²

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.

	AMD Phenom II X4 955	Intel Core2 Quad Q8400 @ 2.66GHz
Max TDP	125W	95W
Power consumption per day (kWh)	abc	abc
Running cost per day	abc	abc
Power consumption per year (kWh)	abc	abc
Running cost per year	abc	abc

Shown CPU power usage is based on linear interpolation of Max TDP (i.e. max load). Actual CPU power profile may vary.

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