The King of NuBus PowerMac Hill, however, is the PM8100, which has all the advantages of the 7100, but in a tower case with an extra drive bay, and was offered in even faster versions, with speeds starting at 80 Mhz, and the faster versions having 100 or 110 Mhz CPUs. I've owned two 8100s, an 8100/80AV and an 8100/110AV, and absolutely loved them both, they were great machines. That said, if someone offered me a 6100, I'd snap it up in a heartbeat - I'd love to get back into the 601 PowerPC game.