I need help with graphic card .I have a P-4 3.0 Ghz,512 MB DDR RAM,intel D915 GAVL board.I want to play games like FEAR,BF2,Elder Scroll 4 but 7900 GT is bit above my budget.I'm incline dtowards 7600 GT but i've been told that 6800 512 MB Xtreme is a better choice as it has 256 bit bus as compared to 128 bit.Now i don't know much abt this bit buses so i need an advice on this one.
Also i have a 350W power supply,will this be ok for 7600 GT.
Yes, 7600GT is a good option nowadays.
I noticed you play FEAR and you have only 512MB. I recommend you to add at least another 512MB. You'll notice a great difference in game performance.
I was previously in the same situation.
Try to get some more budget for the addtional DDR 512MB... it isn't that costy.