I have a 2006 Mac Pro running an ATI 1900XT graphics card, but since it is acting as a server (Windows 2008 R2), 99% of the time it's running headless (Remote Desktop does the job) and the graphics card is producting quite a LOT of heat (can heat a 2 liter bottle of Coke in about 40 min) I would like to replace this card with something cooler and quieter.
I am wondering is there anything that needs to be done to a graphics card that would allow it to be used on a Mac? I would prefer not to spend 2x or 3x the price of a bog-standard PCI-Express "PC" graphics card for a machine that wont be connected to a monitor all that often. I am seeing Mac-specific graphics cards (Nvidia GeForce GT 120) for about 120 EUR on Ebay, but can pick up an NVidia GeForce 210 Graphics card for 30 euros.