illumin8 said:Guys, you're forgetting one thing. The G5 iMac has a 600 mhz. Front Side Bus. It uses memory sticks that are only 400 mhz. How does it do it? Well, you're supposed to install memory in pairs of same-sized, same-brand, preferably same batch DIMMs. This is just like the PowerMac G5. When you buy the iMac G5 with the 512MB RAM option, you're going to be getting it with 2x 256 MB DIMMs, and if you want to upgrade it to 1GB, you'll have to pull both DIMMs and install 2x 512MB DIMMs.
Please, save yourself the headaches and just buy a pair of PC3200 DIMMs from Newegg.com or Crucial or wherever you want.
I've found from my PowerBook G4 that the following pretty much applies to Panther (10.3):
512MB is fine for home use: Safari, Mail.app, iChat, iTunes all running at the same time.
1024MB is fine for "pro" use: Safari, Mail.app, iTunes, Word, Excel, OpenOffice, X11, plus more room for pro applications (I record audio and 1 GB helped out a lot).
I hope that helps.
Why are people just not looking on the Apple site before they are typing ? If you configure an iMac in the AppleStore you can select ONE DIMM.