I confirmed with aida 64 that my mezzanine is running x4. I am doing a swap of a board from one of my 24 drive nodes to one of the 12 drive nodes to see if that fixes it. While doing that I will look closely at the boards to see if the writing is there. Also I need to check into the 5500v5520 chip set issue. Good catch on that. I am running e5530s and l5520s in all my nodes.