@IITravel01,
1200W for 3 S3+ is a bit too high...
We have low efficient PSU and Kill-a-Watt showing 1087-1107W. [...]
I am running my S3's in groups of 3 on respectively:
- Seasonic SS1250X (gold rating); and;
- Corsair AX1200 (gold rating).
Both PSU types run nice with 3 S3's attached (I must add the Seasonic runs best, but both without any major issues with the S3's frequencies set on 225).