You will need to look at the back of the Power supply.  The back of the unit should have a 9.9 on it.  Even my new one says 9.0 on the front.  9.9 just represents the upgrade.  Think of it like a car.  The Corvette has been around for a number of years and is now I believe a C7 model but it is still called a Corvette, not C7.  And when changes are made each year to the C7 model they do not call it C7.1 or c7.2 for each subsequent year.  It is still a Corvette C7, but you still know the difference on the inside.
Randy