Crossfire at 8x?

Reyals140

Junior Member
Nov 11, 2008
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Does anyone have any performance reviews of crossfire (particularly the 4870) when it's on a 16/8x board like the ASUS P5Q Pro
Every review I can find always uses one with two pure 16x's and I was trying to find out how much of performance hit (if any) I would take to save some money....