6850 crossfire won't work?

so i recently purchased my second 6850. i connected them with the cable, and volia, it boots. now all this time i have thought it was working? i recently downloaded gpu-z to test it. it says crossfire is disabled? is there anything i need to enable in the bios or what?

specs

i5-2500k @ 3.3
sapphire 6850 x2
asus p8z77v-lx
corsair cx600
vertex 4 120gb
wd 1tb
corsiar force 3 90gb
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