Almost all AM3+ boards support SLI, and any nvidia chipset amd boards do as well.
That being said, just look at 990fx boards and try to find one that has hdmi out, but why do you need onboard hdmi? if you're going to be running sli..
Does anyone know of a motherboard that can support SLi on AM3+ with hdmi onboard. HELP
if we are talking about the AMD series 9 chipset family, there is nothing with onboard video like the 880G/GX. The chipset versions are only 970, 990X and 990FX. No onboard video for AM3+ series 9 chipset.