Correct. G3 Macs use SDRAM based motherboards which do not interleave RAM by slot banks. There's no advantage to having two 256MB chips versus one 512MB chip (other than cost). On 8/16/05 1:24 PM, Crandon David <tabdave at comcast.net> wrote: > hey thanks Russel. I assume that this iMac doesn't use the > interleaving thing with memory, so there is not advantage in using > two 256Mb chips vs. one 512Mb chip? > > David > > > On Aug 16, 2005, at 1:21 PM, Russell McGaha wrote: > >> David; >> It should have two slots each capable of a 512Mb stick, for a >> max of 1Gb. Yes the 64Mb stick is removable. The slots should be >> accessible with the imac face down, behind a door with a lock that >> can be undone with a coin. Standard pc133 sticks. >> >> Russell >> >> >> On Aug 16, 2005, at 2:59 PM, Crandon David wrote: >> >> >>> Hello everyone, >>> >>> Can someone tell me, or tell me where to look, to see how much >>> memory my uncles iMac can handle. >>> >>> It's a Summer 2001 500MHz G3. It came with 64Mb built-in and he's >>> got a 256Mb chip in there as well. He's gonna upgrade to OSX and >>> wants to have at least 512Mb. Is the 64Mb chip removable?