He conseguido esta informacion y creo que es mucho y prefiero seguir con mi PS3
PC Version Specifications
Grand Theft Auto IV's PC Specifications will be posted here as soon as we receive word on them. The game is built for next-gen consoles however, so we can expect you will need a fairly high-spec gaming PC to play it.
Predicted Minimum Specifications (NOT OFFICIAL)
These specifications are from the PC version of Call of Duty 4: Modern Warfare. We believe Grand Theft Auto IV will have similar, if not slightly higher minimum system requirements.
* CPU: Intel(R) Pentium(R) 4 2.4 GHz or AMD(R) Athlon(TM) 64 2800+ processor or any 1.8Ghz Dual Core Processor or better supported
* RAM: 512MB RAM (768MB for Windows Vista)
* Harddrive: 8GB of free hard drive space
* Video card (generic): NVIDIA(R) Geforce(TM) 6600 or better or ATI(R) Radeon(R) 9800Pro or better
Predicted Recommended Specifications (NOT OFFICIAL)
These specifications are from the PC version of Call of Duty 4: Modern Warfare. We believe Grand Theft Auto IV will have similar, if not slightly higher recommended system requirements.
* CPU: 2.4 GHz dual core or better is recommended
* RAM: 1GB for XP; 2GB for Vista is recommended
* Harddrive: 8GB of free hard drive space
* Video card: 3.0 Shader Support recommended. Nvidia Geforce 7800 or better or ATI Radeon X1800 or better
salu2!!