I just bought my mom a Rev D (Strawberry) iMac. She doesn't know I'm switching her, but at age 74 who has time to mess with Wndows? Anyway, it currently has 64MB RAM and I want her to use OS X for the ease of use factor. Before anybody says anything, yes I know it'll run on the slow side. All she uses her computer for is email, web surfing, writing letters, scanning, and printing. So even a slow computer will be okay. Anway, I do want to max out the RAM but I'm confused about where it maxes out. Lowendmac.com says it varies from machine to machine--some max at 384 and others will do 640 depending on whether a particular machine will recognize a 256 chip. Does anybody have any further information on this? Real world experience? Anything?