So what ratings are necessary you think for a "good computer?" My Rating is this:
Get a ATI 4550 or Geforce 8800 or higher and should run GTA 4 fine, I got a ATI 4750 512MB GDDR5 at 5.0 Rating, My brother has a ATI 4550 512MB GDDR3 runs at 4.9 Rating and runs GTA 4 fine at high.