Yes, that should work. Just make sure that you have a safe place to properly mount the card, and that the cables are well secured. Any movement of either the power or data cables can create issues, and cause early failure. Also make sure that you have very good airflow to the card.Does anyone know if something like this would work to simply power the HP expansion card properly (without connecting the little card via usb to a pcie slot)?
Here is a pic of a similarly mounted card, outside the case.