The easiest way to identify a Jasper model is by locating the voltage/amperage rating on the unit. The number of amps used by the 12-volt rail is 12.1 for the Jasper unit and 14.2 or 16.5 for the older units.
The third and final redesign is the Xbox 360 E, which is not to be confused with the ‘Elite' or ‘Super Elite' – the latter two consoles are actually (and confusingly) just different versions of the original hardware with more hard drive space