I figured I would ask this.... can't hurt! But I have 2GB in my MDD G4, and it's installed as 2 x 1GB Corsair modules. I was wondering, since the MDD has 4 slots, is it possible to max it out to 4GB? I am only asking this because I believe back in 2002-2003, 1GB modules weren't available at the time, but now that they are, will it work? Or how about an odd number like 2 x 256 to make 2.5GB or 2 x 512 to make 3GB? Just wondering... if it doesn't work, no big deal, 2GB is enough... I was curious mainly because I have tons of memory laying around, most of it Mac memory. EDIT - I'm idiot... I should have Googled this... just found everywhere that it won't support larger than 2GB at all. DUH.