Replacing the Heatsink on my Optiplex 745

Ok heres my deal. I have 2 Optiplex 745's that I want to put nice dual slot video cards into. I run into the problem opf the Video card hitting the ABNORMALLY large heatsink assembly in the 745. What I need to know is, before I go ripping this thing apart, will a normal 3rd party heatsink/fan combo fit in this machine? If thats the case I can go buy one and take out the existing one and be able to put my cards in these machines.

What video cards are you thinking about using? The Dell are very limited (if possible at all) when it comes to upgrading to dual cards.

You can find the specs here.
http://www.dell.com/downloads/glob [...] hspecs.pdf

What model 745 do you have?

Mark

The power supply isn't big enough to drive the 3800's.The HD3800 needs about between 450>550w power supply depending on model. The Dell you have only has a 310w PSU

http://ati.amd.com/products/radeon [...] ments.html

You'd need to buy a bigger aftermarket power supply before doing anything else. Sorry...

Any other insight on whether or not I can put a smaller heatsink/fan on this pc without much of a problem?

I realize that this is a bit of a zombie thread, but I didn't think I should start a new thread for the same question. The answers in here ended up dealing more with the gfx cards, and not the initial question of replacing the heatsink.

I had one of these machines end up in my possession, and there's no way that massive cooling tower will fit in the case it's going in. Does the CPU in this model really need that aggressive of a cooling setup (my gaming rig doesn't even have that) or can I get by with an aftermarket LGA 775 heatsink?