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can u suggest an appropriate graphic card?
I'd go with a nVidia card. I had a intergrated card and switched to a nVidia 6800, brought it home only to have it not work properly. The 6800 card required a power supply of 350 watts or higher to run properly. The power supply that is in my computer is only 300.
So i took the card back and got a nVidia 5500 series with 256 mb ram made by evga (I purchased a AGP card) and it worked perfectly. So when you do go for a new video card make sure you bring your computer specs with you and the watt power of your power supply and ask the sales person which card would be best for your computer.
Also the specs for the video card you are purchasing will be listed on the outside of the box somewhere.
Heres a link on how to buy the right video card for you. There are 3 types of slots available in todays PC's. They are PCI, AGP, and PCI Express.
http://www.diamondmm.com/howtobuyvideocard.php
Hope this helps