Big cards in sli too close together

[riddle_me_this]

hi. i have an asus p5nd 750i mobo which has 2 pcie slots that are quite close together, seperated only by one pci slot. if let say i install 2 dual slot cards (9800gtx for example) in sli then there will barely be space between each other, probably 2-3 mm. is it safe to have a setup like that or will it have a tendency to overheat the cards?
ive seen 3 way sli setup where its cards are pretty close to each other but just wanted to make sure it'll be safe.
using an antec 300 case, 2 fans at front and 1 at rear and 1 at top.
any opinions is much appreciated

 

[Lee-m]

most 9800GTX cards come with a nice big fan, and as long as you have a decent chassis fan, I wouldnt worry about it.
im gonna pick up another 9800GTX my self for sli, I might be a bit pushed for space my self.