I'm curious about these connections as well. According to the OCP docs (§4.5 and §10.2) PCIe port3a/IOU1 and 3port3b/IOU1 of the CPU should be routed to the miniSAS connectors. These PCIe connections are/were designed to allow for multiple systems to be connected together using PCIe NTB (non-transparent bridging).Firstly, is there any chance someone can grab a high res shot of the area that's supposed to have MiniSAS connectors? I know the Quanta boards aren't fitted with them, but I'm curious if it's just the headers that are missing.
Even if the only part missing from these boards are the miniSAS connectors there are a few more potential issues to overcome. First, the system firmware must support NTB. I'm guessing that even if the shipped firmware doesn't support NTB it may be possible to enable support via a mod, though, that's wild speculation. The other issue is that from my understanding of things until the E5-2600v3 series there are some fairly serious hardware bugs related to interrupts and NTB.
Anyway, even forgetting the possibility of NTB having access to two additional x4 PCIe ports is intriguing.
--adam