I have only one difference between V1.2 and V2.2 of detected, the air flow of the power supply is stronger in the V1.2 than with V2.2. When V2.2 he is ehr weak, but this is not bad.
For PSU LC Power LC6550 V2.2 550W power supply:
It is a super power supply with many cable required by the computer. It has been left installed even many cable to other components. The fan is very quiet. Surely there is not a high-end device but for normal home computer, it is ideal.