Due to being very impatient (lol), I installed Vue 4 on my current system which is a real whimp compared to some others here. It's a four and a half year old Pentium 200mhz with 64 mb RAM, no special graphics/video/whatevers. And for me thus far, Vue 4 is running like a dream, more stable than v.3, faster with some things, slower with others (volumetrics slow it down but not too badly). So far, I'm really impressed with it, and it seems like if it runs on this machine, it'll run anywhere! ;)