So I have been using my dual 2.0 G5 for about two months now and absolutely love it. The learning curve has been so wondefully smooth and linear, I couldn't beleive that a computer this good, at five yeas old no less, could be this easy and competant to use! I think at this point that I would like to peice another g5 together. Trolling ebay I see a quite a few complete G5's available to be had, some still quite pricey. I think I should like to have a dual 2.7 machine but have reservations about the liquid cooling unit, which makes the concept of piecing one together that much more appealing. One could pick and choose parts as they became available, and use the updated cooling unit. The problem is I don't know the interchangeability of parts between the various G5's. Which brings me to my question. Does anyone know where I would go to find a parts or serial number cross referance to tell me what serial numbers will work with other serial numbers? For instance: I am looking at a logic board on ebay right now. Offered for auction is a Logic Board for Apple Power Mac G5 Dual CPU, Apple P/N 630-4841. It lists 4 or 5 different cpu part numbers it can be used with but does not tell me anything else about the computer from which it came. Where would one go to find the information telling me what it came from and what parts numbers are required to be used with it? Thanks for the help. Anthony.