Hello, and thanks for reading. So, I have a first generation G5 Power Mac. 1.8 single processor. Bought it I think in '04 when it first came out. It still has only the original 512mb of ram (400 MHz PC3200 DDR SDRAM) installed that it came with. So after 5 years, I'm finally deciding to add some memory to this old beast. I was thinking about buying 8 gb of used RAM off this guy for $100. The RAM he has is DDR2 4200 SDRAM. Two of the 1-gig pieces are from Apple, and other 6 gigs are from crucial.com (off brand, I guess). My question is... is this memory compatible with the 1.8 single processor? In your opinion, should I make this purchase? I'm trying to run protools 8 on this computer... upgrade to Leopard, work with FCP, etc.. I'm finally starting to really need this memory upgrade. Any input is greatly appreciated! Thank you in advance.