Xbox Power Supply Compatibility - Microsoft Xbox Repair Manual

XBOX POWER SUPPLY COMPATIBILITY

You can convert a 1.0/1.1 to a 1.2-1.5 by using this diagram
1.0-1.1 Consoles have power supplies with an AT style connector (one row of pins)
1.2-1.5 Consoles have power supplies that have an ATX style connector (two rows of pins)
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