It needs a bit more than that, according to R* :
" We tested similar settings on a fast core I7 with 2 GTX 480's in SLI and seeing a pretty consistant 30fps. The hardware to run this game at FULL MAX settings at 60 fps does not yet exist but the game is coded such that when it does it will take full advantage. "
Was just reading a thread on the GTA forum & came across that. Made me laugh.
