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What would be best for positive air pressure and temps in my case.

post #1 of 3
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#1
Front mounted H100i with a push/pull setup of 4 SP120 Quiets running at 1,300 RPM 37.85 CFM each.
Two AF140 Exhuast on top of case running at 600 RPM 33 CFM each.

So 75.7 CFM Intake, 66CFM outtake

#2
Front mounted H100i with a push/pull setup of 4 SP120 Quiets running at 1,300 RPM 37.85 CFM each (Same as #1)
Two AF140 intakes on top of case running at 1,159 RPM 67.80 CFM each.
One back mounted exhaust AF120 running at 1100 RPM 39.88 CFM

So 211.3 CFM intake, 39.88 CFM outtake. I can throttle the AF140 top intakes to 50% and knock off a few CFM on the intake if that's too much.

I heard when doing a push/pull you cannot count all the fans CFM, but just two of them because that's all they can intake into your case.
Edited by Coldsnap - 7/19/13 at 1:37pm
post #2 of 3
The positive vs negative case pressure battle has been fought for many years. It boils down to what case is in use. I'd try the two top fans as intake and then exhaust and just see which is better while running Prime95 and the Valley benchmarks at the same time.
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The Money Trap
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post #3 of 3
Quote:
Originally Posted by Coldsnap View Post

#1
Front mounted H100i with a push/pull setup of 4 SP120 Quiets running at 1,300 RPM 37.85 CFM each.
Two AF140 Exhuast on top of case running at 600 RPM 33 CFM each.

So 75.7 CFM Intake, 66CFM outtake

#2
Front mounted H100i with a push/pull setup of 4 SP120 Quiets running at 1,300 RPM 37.85 CFM each (Same as #1)
Two AF140 intakes on top of case running at 1,159 RPM 67.80 CFM each.
One back mounted exhaust AF120 running at 1100 RPM 39.88 CFM

So 211.3 CFM intake, 39.88 CFM outtake. I can throttle the AF140 top intakes to 50% and knock off a few CFM on the intake if that's too much.

I heard when doing a push/pull you cannot count all the fans CFM, but just two of them because that's all they can intake into your case.

Even that is a false assumption. The Coolmaster Excalibur is advertised as 80CFM but according to this it only get's about 40CFM while on a radiator. Radiators create restriction which will almost certainly lower the airflow of your fan.

You won't be getting anywhere near the advertised CFM of the fans once you put them on a radiator, and quite hoenstly I wouldn't use the Corsair SP120 Quiet fans on a radiator... The Performance model works great, but the quiet model is quite dinky.

Positive pressure is really only significantly beneficial when you're air cooling, as it helps with keeping tower coolers supplied with air. With a liquid cooling build the only real benefit is less dust buildup, which shouldn't be an issue since you should have filters anyways.
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The Laboratory
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