Rockstar have let slip the system requirements for the upcoming PC version of GTA 4, although they have since been removed from the GamesForWindows site where they were spotted. Fortunatly, we've got them right here. You'll need a dual core processor, 2gb of ram, 18gb of HDD space, and a top end, 512mb graphics card.

They are hefty specs, but GTA is a very good looking game with a lot going on at once, so it makes sense.