CPU fan airflow

[HedBang]

I'll soon be building a new rig (AMD AM3) and plan on overclocking a bit. I will be dealing with my first non stock cpu cooler. I was about to order Xigmatec Dark Knight. http://www.newegg.com/Product/Produc...82E16835233029
Correct me if I'm wrong but I think that is configured to only blow up or down. If I have a top mounted PSU, will it be a problem if the CPU fan blows up into the bottom PSU intake fan? I would think I wouldn't want to add more heat the PSU.

On the case I have a rear exhaust (just below the PSU) and a top exhaust (just in front of the PSU). Also 2 front mount cool air input fans.

Would it matter if I use cpu fan that blows back to the rear exhaust or is the upward fan going to be ok?

Thanks

 

[HedBang]

I'll soon be building a new rig (AMD AM3) and plan on overclocking a bit. I will be dealing with my first non stock cpu cooler. I was about to order Xigmatec Dark Knight. http://www.newegg.com/Product/Produc...82E16835233029
Correct me if I'm wrong but I think that is configured to only blow up or down. If I have a top mounted PSU, will it be a problem if the CPU fan blows up into the bottom PSU intake fan? I would think I wouldn't want to add more heat the PSU.

On the case I have a rear exhaust (just below the PSU) and a top exhaust (just in front of the PSU). Also 2 front mount cool air input fans.

Would it matter if I use cpu fan that blows back to the rear exhaust or is the upward fan going to be ok?

Thanks

Bumping and shortining my original question...

Is there any negative to having the CPU heatsink fan blowing up into the PSU??

Thanks

 

[davidrees]

The answer is "it depends".

It depends on your PS, how much heat you are throwing up in there and what you mean by "negative".

It's really more about trade offs.

It seems like it might make your PS run a little warmer and depending on the PS, it might make the fan ramp up a bit more so - again, depending on how loud that fan is, you may or may not find the increased PS fan activity a problem.

Some systems are actually designed to use the PS to help exhaust some of the heat from the CPU.

If you want another opinion, you really should post more details:

1. PS make / model
2. Case make / model
3. Describe your fan setup
4. On a scale of 1-10, how sensitive are you to PC noise? (I am probably a 7 and my PC has to be inaudible)

 

[HedBang]

This is my case http://www.newegg.com/Product/Produc...82E16811112040 Exhaust fan on top in front of PSU, another in back below PSU. Two cool air fans front panel bottom.

Heres my PSU http://www.newegg.com/Product/Produc...82E16817341022

I'd say I'm not too sensitive to the noise.. maybe 4 out to 10. I'm thinking I've going with a Zalman instead. One that will blow back toward the rear case fan.

Thanks