Was my old one faulty too? What are the odds of having two power supplies in a row that run at 5.xv?
Did your old psu make your computer completely unstable?
because psu's are supposed to have at least 11.5 volts on the 12 volt rail.
im guessing your old one did have 12v on the 12v rail but your new one is faulty so go get it replaced or get your money back.