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Which power supply will work with my Xbox 360 ?

The following diagram will help (check the motherboard connection which will give you the wattage):

Also you can confirm by the following:

Look at the back of the console and check the sticker stating amperages on the 12v rail.

16.5a = Xenon = 203w PSU

14.2a = Falcon = 175w or 203w PSU

12.1a = Jasper = 150w or 175w / 203w PSU