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Larger power supply=cooler cpu?

C

computerdude

Gawd
Joined
Jul 14, 2005
Messages
738
Let me know if this is true or not, I would like to upgrade if it will cool my cpu down a little. Temps over 100 degreess F.Unless that is normal for my cpu idle. I have a Just PC 425w ps now with 20A +12v rail.
 
I am not real sure what you are thinking of when you say larger PSU, can you rephrase what you are thinking?

That being said JustPC PSU's are kind of a crap shoot. I would look for another option.
 
Spectre said:
I am not real sure what you are thinking of when you say larger PSU, can you rephrase what you are thinking?

That being said JustPC PSU's are kind of a crap shoot. I would look for another option.
Click to expand...

Higher wattage, rails, etc.
 
FlatLine84 said:
Depends on the effciency of the PSU and size of the fan.

Click to expand...

Are there specific power supplies for overclocking? I know if I oc heat will be a factor and need to know if there are any out there.
 
Better airflow in your case, and a better HSF on the CPU is what will bring temperatures down. What heatsink are you using now? If you're using the stock heatsink consider getting an XP-90.
 
When power supplies run at the higher end of their capabilities, they become less efficient and generate more heat. So to answer your question: A more capable power supply may run cooler because you may be stressing it a lot less and therefore it will run more efficiently.

Example: A Brand-X 300W runs at 74% efficiency with a 150W load, but only a 71% efficiency at 260W. The 400W Brand-X runs at 74% efficiency all of the way up to 300W. So if your PC tends to run a load of between 260 and 300W, the 300W Brand-X power supply may be "adequate" but the 400W will run cooler.

That said, I doubt you'd run any PSU at more than 50% load (and still have a functioning PC) simply because no after-market power supply has load distribution that is in perfect synch with a home-built machine's power requirements. A perfect balance only occurs with PC's like Dell or HP where the PSU is engineered specifically for the components they put in the case.

When you buy a PSU, the efficiency is typically rated at 50% load at 25C, which is somewhat unrealistic, but you can use it as a reference. The more efficient a power supply, the less heat it's going to generate on it's own... BUT.... it's not necessarily a cooler running power supply.

There's the problem of the power supply being part of the PC's cooling solution....

If you get a PSU with a downward facing fan, your case's ambient temps will be lower, but the heat introduced into the PSU will make it run hotter and therefore less efficient and round and round that problem goes (chicken egg chicken egg.) The alternative is a power supply that has a pair of fans, one on each side of the PSU, which will make your case's ambient temps higher in most cases, but the PSU will remain cooler internally. Pick your poison.

So to answer your question: It depends on the power supply, the load, the case you install it in and how air is circulated throughout the case. ;)
 
RavenD said:
Better airflow in your case, and a better HSF on the CPU is what will bring temperatures down. What heatsink are you using now? If you're using the stock heatsink consider getting an XP-90.
Click to expand...

Yeah using retail hs/fan that came with cpu 3500+. Ok thanks I'll look into the XP-90. Only 2 fans in my case one blowing in and one out. None in front because of lcd temp. display on front panel only one on the side of case and one in back. maybe try a slot blower fan would that help or just over all system temp. I'm looking strictly to cool my cpu if I overclock.
 
Well I'm trading for a aluminum case and hope it has more places for fans. I hate to mod a case just for fans. Isn't there a program out there that you can download to help cool a cpu. My temps are fine now but its just when I want to overclock, I know they will be higher.
 
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