So here is what I have (all G4 towers): Digital audio dual 533 with a blown USB and fried psu. Non DA 350mhz everything working (the one with 4 ram slots and the heat sink without a fan) I know the psu is different on both models. The heat sink also has different "legs" so I can't just swap CPUs. If it were a single CPU I could probably just use the heat sink from the 350, but I would worry about heat. The 350 doesn't have enough "oomph" to run leopard even with the open firmware trick, and the dual 533 has all those problems. Basically I want to get something running with leopard to serve my iTunes, and possibly run iWork. Any suggestions? I also have a pair of dead g5 towers, one has the defective ram slot issue, and the other has bent pins on one of the CPU sockets.