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Joined: Nov 2007
I get around 25 to around 35 FPS, 1600x900, with most things on high (not shadows)
I have an AMD II X2 3.0Ghz and ATI HD4850.
My brother had a HD4890 2GB, 4GB of ram and a quad core 3.0GHz processor. 50-60FPS. He's running Win 7.
But he gave me 2GB of ram, and now he gets a hell load of lagspikes.
So basically, you can run GTA IV just fine with a dual core, almost everything maxed out if you get a good graphics card. But if you're running Vista or Seven then you need at least 4 GB of RAM to not lag.
Anyway, Matthias, what is your budget for the motherboard and what type of RAM are you getting? (DDR2 or DDR3).