The last motherboard for AMD platforms that supports SLI is based on the Nvidia 980a chipset. There are few motherboards on the market with the 980a chipset that support the AM3 socket, and they are already becoming outdated due to the lack of SATA 6Gbps and USB 3.0 support. The ASUS Crosshair IV Extreme is the only one that combines these new features and CrossFireX and SLI support via the third party chipset.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips