I have got a a PC Composed of
Hard drive: 1TB
Processor: Core i-5 2400 (3.10GHz)
but i dont know why i cant run GTA IV
It does run but at option it say warning you are running at graphics settings
which exceed my system. and you cant see the road or many other stuffs and it also hangs.
1. The motherboard doesn't have inbuilt graphics.
2. The processor has inbuilt HD 2000 graphics with 64MB dedicated video RAM. the remaining are taken from your RAM.
Memory doesn't really matter in graphics hungry games. Are you an Indian or Pakistani? They think that the Graphical Memory is what matters in Gaming and so, buy cheap 1GB cards and thinks that they'll perform better than costlier 512MBs...