PC Performance

Haven't heard too much talk about the PC version. I know it isn't out for a few weeks yet but, am I going to need a BF 3 style rig to play this (GTX 560 Ti card) Or will a 460 work ok? I've been praying for years for this to come out and i want the best experience possible. Hoping to God that this game isn't as hard and frustrating as other Rockstar games (GTA: Vice City). That would break my heart if i couldn't finish this after waiting for it for so long!!