You shouldn't have a problem. You will need to get yourself an SLI bridge though. They usually come with new mobos. Pretty cheap off eBay.
Also, when you get them installed and try to switch on SLI in your NVidia Control Panel, It may say you need to shut down the thermal controller. Just press Control-Alt-Delete, go into Processes and scroll down till you find the Thermal Controller process and end it from there. Disregard any warnings it gives you.