Re: Live Recording Computer
Short answer, yes. I use a quad core version of the same machine to record 48tracks from 2 x32s every Sunday, routinely recording 90 minutes at a shot. No issues.
Couple of notes. I recommend reaper since it uses very little processor overhead to record and is stable. Also, that machine has reached end of life on OS and the OS cannot be upgraded past 10.5.8. That means that if you need other or more modern software, you might run into a problem. But reaper still supports PowerPc processors, so as long as you stick to just recording you should be fine.
lastly, I don't know how we'll that machine will perform for mixing. I do all my mixing on a modern Intel i7 iMac and only use the PowerMac for recording. Again. Just something to look into.
if it's cheap (and it probably will be) I'd say go for it.
oh, one last thing. These beasts are heavy. Sturdy, but heavy. Just something to know going in....