Does anyone know which HDMI specification this
gray cable is?
I would assume it came out before the black, but can't find specifications on it anywhere, therefore don't know if it supports 30/36/48 bit colors, "deep color". I know it has to be 1.2, 1.3, or 1.4, but unlikely 1.4. The Microsoft page relating to this and the other HDMIs don't specify anything, and documentation only goes as far to say how to use it. I know the original 360s were only 1.2, but the Slims were 1.3, and now 1.4.
It's the only spare HDMI I have lying around that I could use for other equipment.
I'd really appreciate sources or actual proven experience