ok update guys, i built the beast and runs like a dream, unfortunetely, i have received my gfx 480 and it randomly spits out white lines on the screen, occassionally its fine but then its bad again, it did this the first time i switched on, (even in bios), i have ensured the psu works and my old g card works fine in the pci slot that the gfx 480 is in.
im goin to return to sender as this has put me off a second hand card.
the question now is do i get a radeon 2gig HD6970 for £200 or two radeon 1 gig HD6850 for £200 and cross fire them? i am upping my budget to get new card/cards rather than second hand but £200 is the limit,
btw, 2 hd6950 in my case would fit but it would be tight ish.
My motherboard is a ASUS P8Z68-v lx
1 x PCIe 2.0 x16 (blue) *1
1 x PCIe 2.0 x16 (x4 mode, black) *1
im not sure what speed the pci slots will run if i use cross fire? 16x and 4x maybe ?????? will this affect anything speed wise?
EDIT: im going to do a furmark test on the card shortly, i thought furmark had a stability test but i cant see the option for that?
i also here 16x and 4x can cause problems? maybe one card will be better for reliability and less heat?