SLI in crysis warhead and farcry 2 doesnt work, please help!

this might help.

check to see if theirs a new bios version for your mobo, if their is download it and flash it. load defaults before and after the flash for best results.

check to see if theirs new mobo drivers / get the new nvidia drivers (beta or latest final,w/e)

download those two if applicable, if not, restart, go into bios, and choose the load default options, then choose save and exit, on reboot go back in and change back any of the options you had changed. but this might get it to fully recognise your 2nd gpu.

if this dosn't work try uninstalling and reinstalling your current gpu drivers if you didn't get new ones.

make sure sli is enabled in nvidia control, i know u said it is but sometimes it has turned off on me after some sort of update.

sli is working but you will not see any performance increase. Crysis needs mor than 512mb vram and sli does not double your vram, infact you will still have 512mb vram with 2 cards.