How to tell if the Xbox 360 you want to buy is a Jasper
Found 11th Dec 2008
Just saw this on Kotaku, thought I would pass on the original website to people to have a look at. Basically if you look at the 'barcode'/label on the back of the 360 through the hole in the box, you can see the amperage. If it is 12.1amps you have a Jasper on your hands, if it is 14.2amps it is a Falcon. Should be just above the Made in China writing.