Recently got a Sonnet xMac Pro Server case to put my MacPro6,1 into my rack. I'm getting things fitted into the Thunderbolt expansion housing and noticed this board with a socket on it. The board has power wired from the PSU, but there's nothing in the manual/product details (even though it's in the illustrations) that indicate what this connector is or what its intended purpose is. Can anyone enlighten me?
Edit: I just looked up a video of a version of this module with an outer case, for desktop use. Otherwise looks the same inside. It looks like this might provide power to 2 top-rear mounted fans. https://youtu.be/zG4I8q5JbyY?t=285
What if it was a working protoype?
Maybe? It's brushed over and not directly acknowledged in any documentation for the products that show it. If it is, I'm surprised they didn't at least label it as such on the documentation so people would know it's not intended for consumer use.
Often the X designation in the board revision denotes prototype (pre-production) And production starts with A and then is revised to B etc