Not with nVidia, no, they are 4 displays, always has been. The NVS810 8x display card is using two GM107 GPUs.
AMD is 6 displays. You see this rarely on consumer boards but the ASRock 5700 XT Taichi for some inexplicable reason did expose all six -- with four DisplayPorts to boot, too. I do not think there has been 4 DP or six output customer cards since.