QUOTE(InflatableMouse @ May 3 2007, 02:15 PM)

well thats the point I don't want to buy another videocard I want to use the 7600GT I already have, if possible.
The memory I understand, but still I can get 2x2GB ECC fb-dimms from corsair for roughly 440 euros instead of the insanely expensive 680 euros for the extra 3GB from apple (in which case I will get 4x1GB). That should work right?
The whole point here is of course saving money where possible.
You should be OK with the RAM (see my signature: check Crucial Europe as well).
I have no idea when it comes to the video card, but there should be a way.
BTW, where do you buy a "Baremetal" Mac Pro from?