Sign in with
Sign up | Sign in
Your question

Does lowering CPU core speed save power?

Tags:
Last response: in CPUs
Share
May 22, 2009 5:39:13 PM

I have phenom 9850 BE which i downclock to 1ghz(set at bios=x5), ram to 200Mhz. By doing this, did i lowering my electric usage? I used W7 and play game with no performance impact.
May 31, 2009 7:27:17 AM

Most likely, yes. I would like to say absolutely yes, but you can't say that if you don't actually test it. ;)  Component temperatures tend to rise as more power is used, and tend to decrease when less power is used. If the temperature also dropped it's pretty much guarantied that your power consumption dropped.
May 31, 2009 7:29:40 AM

a bit but not as much as lowering vcore.
Related resources
a c 172 à CPUs
May 31, 2009 9:19:21 PM

Will the reduced power consumption noticeably affect your electric bill? I doubt it. Greater effect if you turn off the computer whenever you are not using it.
a c 83 à CPUs
May 31, 2009 10:11:10 PM

Lowering the clock speed won't drop power consumption much unless Vcore is dropped too.

I don't know why you don't just use Cool n Quiet, I've got it enabled using Vista and when I choose power saver my Phenom 9850 remains at 1.250Ghz, Balance allows it to automatically scale between that and 3.0Ghz, and Performance leaves it at 3.0Ghz constant.
a b à CPUs
June 1, 2009 12:32:10 AM

If I remember correctly, power scales directly with core speed, and directly with voltage squared. So, you have saved some power, and if you decrease the voltage as well (it should run at the lower speed with quite a bit less voltage), you'll decrease the power even more.
!