what was wrong with the HDMI ports?
Settings were all messed up 
Is the 2nd HDMI connector connected to the onboard system or to one of the GPU?
Is the M.2 SSD slot limited to 42mm?
Can you confirm that there's 2 RAM slots?
Is Linux a straightforward install or is there anything we need to watch out for?
I just ordered 1 PandaMiner, had I seen your thread earlier I would have ordered more to save on shipping.
I'll try to put esxi on and enable GPU passthrough so I have the flexibility of switching OS quickly.