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Chips at the back of the miner will always be very hot and will depend only on air, instead of termal conduction of a large heatsink. Meaning that they will overheat easily and thermal adhesives tend to lose their grip on higher temps. Which can end in heatsink unsticking from the chip.
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May be a good reason to try a new configuration with the S7 ... as in having the fans strapped at the top / bottom top rather than front / rear (that'll require the unit being stripped though as top and bottom are sealed). That way, I suppose, even the fan specs can be downgraded as the distance to exhaust has been more than halved. (just a thought!)
The S7s are really loud and noisy - but currently is my best miner so far very steady 4.8TH to 5TH @ 58-62c average, fan speed 60%
I have seen in other post, people putting duct tubes, insulation, some crazy stuff to reduce noise and heat.
It will be great to 3D print a "noise and heat reduction" kit for S7s, given that we have a lot of experience and lessons learnt from the S5 mods.
This project will also give me the "energy" to start installing my I3 printer currently still in the box, manual says 5-6 hours installation time required... sigh.