The 2 S3's are running off of an Enermax 1000W (ERV1000EWT-G) PSU I pulled out of one of my S2's. Each S3 is averaging 440Gh/s (+/- 5Gh/s)
While not perfect (lower than projected speed due to power issues), an excellent delivery just 1 month after the initial announcement. Good job Bitmain.