AriesIV10 just mentioned this on the forum and they are right. The RPM's on your fans are WAY TO LOW! If it is on auto, take it off of auto and put it on manual to 100% as soon as possible. At least 80 or 85 percent minimum. My guess is you already have them on manual and need to increase the percentage.
I am very curious about how high temperatures would affect the lifespan of S7.
It seems that from purely chips perspective, everything is peachy for OP even at as high as 73C (as far as error rates are concerned).
I try to maintain less than 60C, but some folks swear for mid 60ies as a better range.
It would be very difficult fact to establish. On the other hand, SPT was fine at up to 115C (direct chip temp, though).
i would hate to miss out on a potential +5-10 % of the hashing IF it does not affect the lifespan, but it is a big IF, of course.
On the other hand, why would Bitmain optimized fans (I am talking about auto) for 45-55C when they could have run them at 65C if it is all good at those temperatures?
I have ran all my S7's at ~62 C; I haven't had any problems. Each S7 hashes about 200gh/s more when using manual fans targeting 62C. Those of you who don't believe this; try it for a day with one of your S7's.
If you are afraid of heat damage I suggest you get an old miner and stress test it. I have done this with many miners; I ran an S1 between 82 and 93C for 3 months. It had a higher error rate at that temp but otherwise was fine.
Running fans at 80% or higher will only use more power and increase vibrations; which will eventually result in your heatsinks falling off.
