Yes you will need a new motherboard. Your old system uses AMD processors, and you want to use Intel. The companies are direct competitors and their hardware is not compatible. To show the point a little more, it would be like if a big truck painted Pepsi blue with Pepsi written across the side and after they unloaded it someone asked the Pepsi company if they would mind loading it up with Coca Cola. Not gonna happen.
Though without knowing more its hard to pick the best board for you. That one should work fine with SLI, but any other extra features you may need are just guess work without knowing your other hardware or case size.
Also if you don't plan to overclock, you are better to get a Xeon processor.