Just fyi, the Apple docs I remember said those machines maxed out at 192 MB, not 128, but.in any case those numbers are based on the biggest so-dimms that were available when they shipped. All trayload iMacs support up to 512 MB with the right modules. (The key there is "right modules". There are a multitude of threads out there describing the RAM upgrading peculiarities of those machines so I wont rehash it all here.)