My system:
Intel Core CPU 6400 2.13 GHz
2GB RAM
Nvidia GF 7950GT OC (I've had some troubles with this card though, gets too warm all the time, freezing up my games when I play...never when I play OFF though).
I'll have to look up my specs. for OFF later on, don't know right now, but I agree that the game looks pretty neat from time to time!
