Maintaining positive air pressure with multiple radiators?

[t1337Dude]

How is this achieved? I have a Corsair 450d case. I currently have a 280mm (Swiftech H240X) mounted on top as exhaust, with two 140mm intakes in front, a 120mm intake on bottom, and 120mm exhaust on back. I've heard it's a bad idea to use radiators for intake because you're putting hot air into the case. Does that mean I'm (A.) limited to just one more 120mm radiator (on my rear?)? Or would it (B.) be better to just have negative air pressure in my case and put a 280mm exhaust radiator in front?

Or (C.) have the 2x 140mm fans in front do intake with a radiator anyways, having it be the last radiator on the loop? This would also let me put a 120mm radiator in the back.

Thanks.

 

[Tsumi]

It's BS. Yes, the air will be warmer, but only a few degrees warmer. It's not going to have a large enough impact. Maintaining positive air pressure and proper case airflow will be far more important for keeping the rest of your components cool.

I added a 280 radiator as an intake at the bottom of my case, though I do have 4 additional 120 mm intakes. My temps are lower with lower fan speeds.

 

[n=1]

Yeah when I was still on stock GPU cooling and had an H110 on my 4930K, using the radiator fans either as intake or exhaust resulted in a temp difference of about 5C I think.

Mind you this was with 2 970s at 1520/7700 dumping ALL the heat into the case. So roughly 360W worth of heat.