Just ran across a technical guide for T7920 which included technical specs for Dell Ultra-Speed adapters.  Hope that it could add more useful information for you. [IMAGE]
Hi everyone. Looking to add M.2 SSD card slots. Perhaps Dell PCIe x16 M.2 SSD card, DP/N 414-BBBJ or Dell PCIe x8 M.2 SSD card, DP/N 400-AKSO.  Need help to find the Dell specifications.  The Dell 4x m.2 PCIe x16 version of the HP Z Turbo Quad Pro (servethehome.com).   [IMAGE] 
Precision T7910, quad PCIe/ NVMe SSD option