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I've been running 24 Gigabyte GTX 1070/1070ti's for the last 4 years and they're all still running fine.  But one card has always had rather odd characteristics.  It runs around 10 degrees (C) less than the others.  (both gpu and hotspot).  All settings the same but it just runs a lot cooler with the same hashrate.  Sometimes the "fan stop" light comes on as the fans slow down and stop cos it's just not getting hot enough.  And yet it hashes just as good as the rest of them.

I can only assume it's due to some random serendipitous manufacturing "defect" that has made it unusually efficient at dissipating excess heat. Incidentally, makes no difference what position in the rig the card is.



You get some weird shit in electronics sometimes.  Years ago, I was working on a faulty circuit in a module that I finally traced to a copper track that had a micro crack causing the track to exhibit diode like properties.  i.e. It would only pass current in one direction.

Whatever is responsible for reading °C in your GPU is faulty, 10°C is fake reading do don't be fooled by that, always make sure you crank up your fan speed to something like 65% just to be on safer side, I once have a weird GPU with same issue before

Very doubtful.  The card has been running reliably for 4 years like this including 4 Australian summers where ambient exceeds 40 degrees C.  Also both the GPU and hotspot reported temperatures are 10 degrees lower than usual.  And if there was a measuring error then the backplate would be noticeably hotter but if anything it's cooler than the other cards.

I also have one ZOTAC Geforce GTX 1070 AMP Extreme card and it runs at 5 degrees cooler and its fans sometimes stop. This is because its cooling system and heatsinks are almost 2 times larger than other video cards, for example, ZOTAC GeForce® GTX 1070 8GB GDDR5 :)
Very often temperature sensors are faulty