I have two G3 desktops, and both are maxed out with low-density(and low profile) 256mb PC-133 RAM for a total of 768mb. I recently acquired a pair of Minitowers-one a regular, and the other a server. I haven't changed the memory out in the server(I've focused more on getting the hard drives set up how I wanted) but have been playing some with the RAM in the other minitower. The previous owner had a installed 3x64mb high density PC-100 modules, and the computer works fine with these. I went through my memory drawer, and initially started trying to install a single PC-133 256mb low density module in place of one of the 64mb. It would chime, but would not boot. I then switched over to low density PC-133 128mb sticks(I have a TON of these), and it still wouldn't boot. I'll also add that I was careful to only use non-ECC memory. The only way I can get it to boot is with the 64mb modules. Any ideas about what could be going here? Am I just going to have to live with this computer having 192mb of RAM?