Cognoscenti Cabrio [V]
The Games for Windows website has opened a section for the PC version of GTA IV, which reveals the recommend system requirements:
OS: Windows XP SP2
Processor: Dual core processor (Intel Pentium D or better)
Hard Drive: 18GB free hard disk space
Video Card: 512MB Direct3D 10 compatible video card or Direct3D 9 card compatible with Shader
Drive: DVD-ROM dual-layer drive
The minimum requirements are not known yet.
In the meantime, the information has been removed from the website.
Please fill out the whole formular and don't forget to enter a valid email address to be able to verify your account.