Originally Posted by Programmer
I suspect you had a deeper problem then. My G5 took to Leopard just fine, and I'm quite sure that most of them did because that's the experience that Apple wants its professional users to have.
Well, sadly that wasn't the case for me. This is my 16th Mac.
I'm a longtime professional user myself - I'm a record producer/recording engineer - and this issue made it impossible for me to do any composition work in Logic Studio, due to the aforementioned spinning beachball/howling fans etc.
I also have a Quad G5 which I run Tiger on for my Pro Tools HD rig, and that's been great. Even my now-replaced Dual G5 was fine with three PCI cards installed under Tiger, apart from the loud fans of course, which is a pain in an environment where noise needs to be kept down.
Still, as I said, I'm thrilled with the MacPro - it's handled everything perfectly, and on top of that it's really incredibly quiet - even with 4 HDs in it - so I really couldn't be happier at this point.