Store the salted prime rib uncovered in the fridge overnight, which will ensure the meat is juicy. However you season it, let the prime rib come to room temperature before you put it in the oven.
Put the prime rib into the oven at 500 degrees for 15 minutes and then, without opening the oven, drop the temperature to 325 degrees for roughly 11 minutes per pound. Test with a meat thermometer try ...
An instant read thermometer ... meat shop cut to any size from 4 pounds and up, or with any number of ribs. Beef roasts such as this can go by different names including standing rib roast, prime ...