I am new to Mac's, and to this list as well so perhaps what I suggest might not be quite true. I understand from conversations with another Mac owner that your memory needs to be DIMM's as low density memory works best in Mac's. PC100's are used in Macs and PCs as well. For that matter, if a Mac follows PC's architecture you could even run PC133 memory instead of PC100. Just nothing designed for slower busses like the PC66 memory as an example. If this is wrong, someone mention it please! Kris PS. I do rememeber reading somewhere that the Mac is unique in that it will also utilize the memory found on your Video card for processing. I wish I could remember where that was now. -----Original Message----- From: g4-bounces at listserver.themacintoshguy.com [mailto:g4-bounces at listserver.themacintoshguy.com] On Behalf Of Bob Schmidt Sent: Saturday, November 12, 2005 9:48 AM To: A place to discuss Apple's G4 computers. Subject: [G4] Memory Hi All, This is probably a stupid question, but here goes. I have a G4 AGP Graphics running 10.4.3 with 512mb of ram. I was looking in the system profiler and noticed that this computer has pc100 sdram. Can I take pc100 sdram from a pc and use it in this mac? Thanks, bob