I'm using Asus P4-G41T-M LX Motherboard i want to add graphics card into it. I do not know which type of Graphics card will support DDR2?? or DDR3 ??. Can you please suggest me on this...
Graphics card has their own memory.
It doesn't have anything to do with the motherboard memory.
It will work on motherboard with DDR2 or DDR3.
If you are on a budget get an AMD Radeon HD 6670 or HD 7750.
Both of these cards will work fine on 300W PSU.