Crossfire if bottom card is 1cm away from PSU?

Hi I have a P5Q-E motherboard and currently have a Sapphire 4850 BIG FAN duat slot graphics card. What I was wondering that since you can soon(or now.) use one card for physx and the other as normal, Im imagining my 4850 being installed onto my second PCI graphics card slot(have 3 slots) now if I did do this there would only be im guessing around 1cm-1.5cmof space intill it hits my psu. I have an antec 900 were the psu is at the bottom. (a Crosair 750 TX 140mm fan.) Now my question is, is it a problem for the 4850 with its massive fan to be very close to the 140mm fan of the psu (1cm-1.5cm away.) How will warm air be removed if the psu's fan is blowing straight on to the graphics card, and maby pushig hot air back in?


Im guessing if only this is actually a problem is I Would have to get a full tower case to have my psu more by its self.

any answesr????????????

The PSU is indeed mounted upside down with the PSU exhaust fan pointed upwards, same as in the Antec 1200. However, there is no air being blown onto the vid card since the PSU fan is an exhaust drawing air from inside the case to the outside. The OP doesn't have anything to worry about. If anything, the PSU fan is doing him a favor and drawing hot air away from the vid card and exhausting it outside the case.

I own both the Antec 900 and the 1200. I would not hesitate to crossfire/SLI in either one.

I've ran two 8800GT's with dual slot exhaust coolers in my Antec 900, w/ a 750TX. There wasn't even a 1C difference in temps between the two cards, it'll be fine as long as they fit.