Data gathered from bitmain emails
default value for S4 is 0725.
they also said s3 is 0760 or 0770 and s3+ is 0750
idk... hard to know without investigating firmware without custom settings
S3 is 441gh/s and S3+ is 453gh/s
Edit. (OCFREQ/REGFREQ)xAMPSxVOLTS×#chips=WATTS