Nvidia has never released SLI-capable motherboards for AMD chipsets, focusing most of its efforts on Intel-based processors.
The company has since changed its position on the matter thanks to feedback from gamers.
"Long term gamers probably remember that for a long time AMD offered great high-end CPUs, but in recent years, AMD’s stature as the preferred gaming CPU fell by the wayside and Intel CPUs have been the gamers’ choice. For this reason, we’ve only licensed SLI for motherboards with Intel chipsets. However, we’ve been recently hearing chants of “SLI for AMD CPUs”, and figured that now is a great time to do it. After all, we want to make sure gamers can benefit from the new CPU competitive landscape and ensure they have NVIDIA SLI – the highest performance, most stable multi-GPU solution – to game on! According to Steam, 93% of all multi-GPU systems in use today use SLI."
Today, Nvidia announced that SLI is being licensed to motherboard companies for integration onto their upcoming motherboards that feature AMD's 990FX, 990X and 970 chipsets.