So I was unpleasantly surprised when my ati R9 280x wasn't capable of this feat. Apparently it could only work with a displayport adapter with multiple hdmi ports.
FYI I have multiple (passive) hdmi adapters, so the single hdmi port on the (MSI) gtx 780 isn't a the problem here.
FYI I have multiple (passive) hdmi adapters, so the single hdmi port on the (MSI) gtx 780 isn't a the problem here.