make sure you have a free AGP or PCI slot for the new video card, then read some reviews for video cards at an online vendor that sells computer parts, and lets buyers leave reviews.
No better way to make a decision than to read what people have to say about the product you are considering.
The more I learn, the more I know I don't know enough.
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For those about to rock, we salute you.
NO DISASSEMBLE!