Just got a new computer in the past month. Athalon 64 FX55, 2GB RAM, 2 NVida cards, Win XP Pro SP2,abspc.com works great! I have locked up P6 on it a few times but that happened worse on the old comp. I like to push things sometimes just to see and scenes with a lot of objests mainly trees and plants slow it down or I've gotten the "not enough memory" message twice. I like to use raytrace and IBL/AO lighting also and that slows the render some. But hey, my longest render so far has been about 45 min, lol. My old, old computer with Bryce 4 was sometimes 6-8 hrs render so I'm not complaining with an hour render at most. I'm not sure if the 64 bit comes into play right now as I think P6 is 32 bit. Good to be prepaired for the future if your upgradeing or buying a new machine.