Wow...I hope you still read this as that board is NOT SLI CAPABLE. The only amd boards that are capable of sli are ones with nvidia chipsets and to get one in your standards it would have to be the nforce 980a chipset.
On newegg there are currently two boards matching this description:http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007625%20600008309&IsNodeId=1&name=NVIDIA%20nForce%20900
However I would seriously suggest choosing a different route such as amd graphics or an intel chipset. Nvidia chipsets suck and the sli scaling is horrible, note recent sbm. I seriously suggest taking a good read of this article: http://www.tomshardware.com/reviews/overclock-cpu-build-a-pc,2700.html
A sli gtx 460 setup is potent but on the wrong platform the results won't be what you want. If you want to keep the sli 460 I would suggest going with the i5 750/760 if you want a quad core and just forget about how many pci lanes there are. X8 will NOT be a bottle neck