Hi,I just installed a second gpu and updated the driver for it. My pc recognizes both gpu's but I don't know where to enable SLI mode. In Nvidida control software there is supposed to be a place but I don't have it. I have the latest Nvidia software installed. The cable is installed on the gpus and I turned on SLI in the bios. Thank you for you help and Merry Christmas.
Have a read of this and see if you have any luck: http://www.helium.com/items/589707-how-to-enable-nvidia-sli