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How much will a higher CFM fan help me?

post #1 of 7
Thread Starter 
In the process of putting together an external WC loop but I want to help drop some temps *now* without spending much money.

Got a RFX-120 fan on my CM Gemini heatsink now. 88CFM @ 38dB.

Would a fan in the 100-130CFM range help drop temps? I don't mind noise too much but I don't wanna spend $5-$15 for 1C and 20dB more noise. If I can get closer to 5C I'd be a happy camper.

I plan on lapping the heatsink/CPU but I want to push it off as long as possible. I've lapped before but it's a PITA tongue.gif
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post #2 of 7
You want more static pressure for radiators than CFM.
post #3 of 7
Thread Starter 
It's not for a radiator ...
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post #4 of 7
Same idea for that heat-sink bro. The more restriction, the more useful SP is.
Edited by TheLawIX - 5/25/13 at 2:28pm
post #5 of 7
I would recommend the Koolance FAN-12038HBK 2600rpm fans, at $9/ea you get a dual ball bearing motor, 117CFM, and 6.33mmH2O of static pressure. It's powerful, responds well to voltage control, and will push a ton of air through even the densest radiators.
Get a pair of them to use on your current heatsink, then switch them over to a radiator once you have your loop setup.

You can get them @ Performance PCs.
   
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post #6 of 7
Quote:
Originally Posted by nleksan View Post

I would recommend the Koolance FAN-12038HBK 2600rpm fans, at $9/ea you get a dual ball bearing motor, 117CFM, and 6.33mmH2O of static pressure. It's powerful, responds well to voltage control, and will push a ton of air through even the densest radiators.
Get a pair of them to use on your current heatsink, then switch them over to a radiator once you have your loop setup.

You can get them @ Performance PCs.

I second that. 6mmH2O static pressure is a massive amount, and 117 CFM within a 120mm fan area is plenty.
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post #7 of 7
I suspect much of the problem may be getting cool air to cooler and removing it's hot exhaust.
These downflow coolers are notorious at pulling hot exhaust air back into themselves.
The fan pushes air into cooler > hits mobo and turns out > hits GPU / RAM / mobo heatsinks and turns up > and fan sucks it it back into fan.
I've had pretty good luck turning the fan so it sucks out of cooler.. especially if there's a side exhaust in case to pull that heat on out.

The cooler the air into your cooler they cooler your CPU. Every degree hotter the cooler intake air is translates to a degree hotter the CPU is.
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