SLI with this Motherboard?

[seanpull]

http://www.microcenter.com/product/382952/970_Extreme4_Socket_AM3_970_ATX_AMD_Motherboard

This is the motherboard that I will be using for my gaming build. It has two PCI-Express 2.0 slots. Now, are those separated, or back to back? I'm getting a single GTX 660 today, and maybe a year or two from now, get a second one when games get more demanding. Since the GTX 660 is a two slot card, or at least my EVGA one is, will I be able to run SLI while using PCI-E 2.0 slots for both, or will one have to use a PCI-E 1.0 slot? Also, is there a major performance decrease when using PCI-E 1.0? Thanks in advance.

 

[Deemo13]

http://www.asrock.com/mb/vga.us.asp?Model=970%20Extreme4&c=2

Something tells me that it supports more than this, but this is just motherboard supported.

 

[IMA UNICORN]

the MOBO would sli a 660 perfectly, apart from not maximizing the pci3.0 speed that is compatible with the 660. when you sli it the slots dont revert to pci2.0, they normally run at x16 speeds and in an sli they run both at x8 speeds. i have a evga gtx550ti sli atm and that runs fine at x8 speeds. If you ever felt the need you could 3way sli your 660tis