FX-8350 Motherboard

a radeon 7870 uses 3.0 to, but  it wont use the bandwide of it :)

Just because you can plug something in it does not mean it uses it.

 

Also, if you plan on adding a second card in TWO years, it's almost garantee you won't. In two years there will be newer, better GPUs for cheaper than a second card.

Since there will be no new desktop cards from AMD this year the only time we'll see a new card from them is in two years theoretically.Even then who knows how much better those new cards will be. I don't care much for Nvidia cards since I never use programs or games that use their specific technology.