SLI support
 

I am going to be building a PC in the next couple months and am moving my way up to PCI Express. The mother board I am going to be getting supports SLI (Scalable Link Interface) which from what I understand links two video cards together and they work together.

http://www.newegg.com/app/ViewProductDesc.asp?description=14-140-047&depa=1

That video card has it. I am wondering if there is any software involved in this or if it is only hardware? If there is software involved, is there Linux support yet?

The Motherboard I"m getting is:

http://www.newegg.com/app/viewproductdesc.asp?description=13-136-152&DEPA=0

Thanks