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I've heard (I forget where) that 8x is usually only about a 7% decrease over 16x when used in crossfire with a 16x card.

So an 8x isn't half speed.
 
Do you honestly need two, because my card only has one input. :mad:

If your card has two, you need two. If you look at my pictures near the beginning, my card has two plugs — a six pin and an 8 pin (which I used a six pin in.)

If your card really only has one plug, then you only need one.
 
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