It should work provided there are no hardware defects or bad contacts.
Use page 1-33 in the RVIA manual as reference.
Unplug all other drives and leave them disconnected until you have finished installing Windows.
Check if 660p shows up in BIOS
If it doesn't:
If it shows up in PCH_DIMM.2 (without problems), try CPU_DIMM.2 again. If it's flakey try mounting the 660p on the other side of the DIMM.2 riser card.
If problem persists in CPU_DIMM.2, try the other included DIMM.2 riser card.
If problem continues to persist, check CPU seating and socket for bent pins.
If everything checks out mechanically, there might be a hardware defect with the CPU_DIMM.2 slot, MB traces, and or the CPU itself.
If all test in both slots fail, it's most likely the 660p itself that's has a defect (IMO). Verify drive in another computer before RMA if possible.