Your Computer Will Rape GTA IV. But Then Again Many High End Pc's Don't Perform Well With GTA IV Because It's So Badly Optimized. But If Anything Try The "commandline" Tweak For GTA IV.
gta should in theory run very well but in practice it doesnt.
doesnt like new hardware.
doesnt like old hardware.
you can have a great pc and it will still be choppy because its so badly ported. even with patches i will get better fps on it than some 1 with a new build that is better than mine. yes you can tweak it but really you shouldn't need to.
oh and it doesnt work on windows 8. so even if you did get it running on your hardware your o.s would break it.
upgrade to windows 7 and forget windows 8 till at least service pack 1.
This better be a joke! Of Course GTA IV can be maxed out on the 7870, I do think that 'ImNotStevie' is playing a joke upon us. The 7870 is a powerful card. GTA IV can be maxed out with any mods such as IcEnhancer on the 7770 itself then just imagine the power of the 7870. I myself use a GTX 660 Ti.