I'm not sure i"m gonna do it but i'd like to know how I can OVERCLOCK to the maximum SAFELY the ANTMINER S7? 
If I had an S7 & if it was a 4.86TH unit and if I was going to overclock it I would adjust the psu to be 12V + 5% (12.6V) at the PCIE connectors then take it up a step at a time, check for HW errors and keep a close eye on the temperatures. Theoretically from the BM1385 data sheet about 725MHz should be possible, but with them reducing the spec for some Miners that is more uncertain than usual.
The above just my thoughts and in no way a recommendation, Overclock at your own risk. I am sure someone will hae tried it and have some real experience, but may not share until Warranty has expired.
Rich
They really have killed some testing with their policy's now on warranty. In S3/S5 there was a lot of overclocking and sharing of data. I did not think anything about overclocking. Also switching fans to quieter fan's they killed as it violates warranty. I suspect some have tried it though to.
But now the 90 day warranty is violated by doing almost anything. So basically first 90 day's you would be nuts to overclock. I don't even overclock myself during warranty as I feel if I have a problem I will get screwed. I don't suggest anyone overclocking. And Rich is very right if it is happening it will not get posted, as then it's proof of void warranty.