I have a early 09 Mac Pro with the 4870 and I just received the GT 120 so I can run dual 24 ACD. When I install the GT 120 do I want to install it in the slot right above my 4870? Or 2 slots which would be slot 3. If I install right above my 4870 then the GT120 would be right on top of the 4870 and doesn't seem like there would be much air flow getting above the card. Or does it not even matter which slot I install the GT120?