hey dude i got a G5 powermac and running 8.1 with 2 gig ram and it does exactly what i need but i wouldnt mind knowing some tweaks etc also i didnt think the g5s supported more than 4 gig ram? and would it be worth me getting more ram for it? but like i said i have run Drum core on a full VI session that runs fine on mine, also BFD and the best one i have ever used is Addictive Drums!! they are just the best!!! hope that helps a bit lol
