I have a Windows XP Home Edition version 2002 SP-3, Pentium(R)D 3.00 GHZ,1 GB RAM with VGA card of RADEON X300/X550 series and RADEON X300/X550 series secondary ( might be of 128 MB). I need to replace it with a VGA of 512 MB or higher than that( of nVIDIA or ATI ). I need to know the power available ( best is 350 to 420 watt) in my system and also which VGA card shall be most compatiable for my system.
