I removed all the other cards in the system (NVMe adapater, Fusion-IO card, and a SAS HBA), went into the bios, and changed the PCIe bus setting from Auto to Gen3. Booted into windows and ran a crystal disk test. Card is now operating at full speed. Either having the bus set for auto or having a PCIe 2.0 Fusion-IO adapter in the system seems to have been slowing everything down.