This is an AMD/Crossfire board so no you cannot SLI in the future. About the card, all it needs is a PCI 2.0 capable mobo and this certainly has. Why are you planning to SLI in the future have you ever had a 2 gpu configuration?
The motherboard you posted will not allow for SLI, it only supports crossfire. It also has 4 PCI-E slots which is most likely not needed, below is a decent motherboard that has two PCI-E slots (all that you will need), costs less and supports SLI...
Well I wanted to try nvidia card because I've always owned ATI and I have this mobo on my other pc and I absoutley love this mobo.I do have 2 5850 on my pc but never sli. I don't know much about sli so thats why my question was dumb.
So I can still use this 460 on this mobo even if i don't want to sli?
I just ask that because i didn't know i could do that on a xfire board.
Yes you can use the card and will work fine. Using a Gigabyte GTX 460 on a 790x board. SLI hehe the answer is yes if you know how to do a google search to find the hack (software) that I tested my self and works. Enabled sli on my Gigabyte ga-ma790x-ds4 using two 9800gt 1gb editions. Win Vista x64.