Sorry if it has already been asked/discussed.
I was interested in building an homeNAS with Rockstor by using one of those Asrock server motherboards with Atom Avoton SOC (the C2750D4I or C2550D4I model). Those boards don’t offer any USB 3.0 port but have a PCIe 2.0 x 8 expansion slot: please will I be able to use that for adding a card with those ports (I need them for backing up on external drives).