I've got a system with these specs:
Processor: AMD PHENOM 9950 QUAD-CORE 125 AM2+ 4MB
Moterboard: GIGA-BYTE 770/SB600 SAM2 ATX/GA-MA770-DS3
RAM: 2 x A-DATA 1GB DDRII PC6400 DDR800 DIMM1GBPC800-RPPAK2 (4GB total)
Hard Drive: SAMSUNG F1 750GB SATA2 7200RPM 32MB HD753LJ
Graphics: ASUS RADEON HD4850 PCIE 512MB GDDR3
I'm pretty sure GTA IV will run OK, but I'd like to know if it will run on maximum, so if anyone has a similar system, please drop a line.