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can i use my power supply cable?

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Im buying a 6800GT by Asus 128 mb on newegg.com for $339. It doesnt come with a computer power cable that goes from the video card into a free wire on the power supply. Can i do a trick and take the cable from the power supply and try to make it fit into the card without any extra cables needed or get 1 with the extra power cable?
Thanks a lot