It's well within the spec of the chip, so it's all just down to cooling. Trouble is you only know the temperature in the middle of the board. So my concern would be what the actual temperatures of some of the chips that are getting less cooling are going to? With the "Right" cooling it should be ok... but there would be a much less margin for error.
Rich
Well said, but I'm just the type to baby my equipment because I personally feel the S7 will be able to mine profitable for possibly as much as 2 years. Especially, if you live in low power cost areas with 3 cents or less per kWH. I believe there will come a time the heat will take it's toll on the boards and you will slowly lose one chip after another if not properly cooled. That's my opinion of course. I hope you will be able to prove me wrong but only TIME will tell.