let the prime rib rest overnight coated in salt (the dry brine!). roast for 2-3 hours at 250F. rest the meat. blast at 550F for 15 minutes to crisp up the outer crust.
if you have the bones removed by a butcher, roast them next to the boneless roast in the exact same way. they're delicious! add other spices that you like to the dry brine mixture.