Noveau doesn’t work with the card. As far as I am aware they don’t even support the chipset at all*. When I tried to boot with noveau all I got was a corrupted screen of white with random specs of bright colors.
I have an older card, GeForce 7600 GS, that runs fine on the same system with the 304.xx and older. 310.xx of course dropped support for that generation. I only tried the card in the one PCIe x16 slot and it didn’t occur to me to try it in a PCIe x1 slot.
Unfortunately I can’t right now test it in a PCIe 1x slot, because I am trying to get the store to take the card back and they have it. Apparently they tested it under Windows 7 and concluded it to work. Doesn’t help me much though.
*) http://nouveau.freedesktop.org/wiki/CodeNames - doesn’t list GK106