No u dont need a 8X slot. Even a 4X slot would do. The 8X card will just run at 4X and there isnt much of an improvement between 4x and 8X anyways.
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AMD 64 3500+ Venice
DFI Lan Party Ultra-D
2* 512 MB PdP Memory with 2-2-5L timings
XFX 7900GT 256 MB Card
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