Compatibility: The 6-pin connector is for the "fat" original Xbox 360. It is not compatible with the Xbox 360 Slim or E models.
Power Ratings: 6-pin units come in 203W (earliest), 175W (Falcon), and 150W (Jasper) variants.
Distinguishing Feature: The 6-pin adapter features a distinct, rectangular-shaped 6-pin female plug, often in a gray color.