First, before I begin, things I already know - 1. Snow Lepord will not have Power support 2. The G5 is very old 3. If Windows runs at all, its performance will be very poor. That aside, I am considering purchasing a Powermac G5 Quad. What for? My A/V needs until the end of the year or early 2010, when I will be able to buy a MacPro - after that, it will more-then-likely serve as a disc server. I am considering the 2.5 Quad. Basic things I would like to know (because I have been searching and results can be obfuscating at times) - Do all of the Quads have PCI-E? (related, were there any other models with PCI-E?) Are all of the Quads water-cooled? For that matter, was it that bad? What type of RAM can I use? NECC PC2-4200 DDR2 SDRAM? Furthermore, what are some general things that I need to consider before I pull the trigger?