well based on the cards [ manufacturing ] theory the behavior looks a little odd. May be a bios fix in future should fix this. But still I like cooler gpus even if the fan have to spin. The cooler your gpu stays it will run longer.
Yes,the behaviour looks very odd to me as well because the fans of the 2gb Zotac GTX 960 that i had earlier used to stop spinning whenever it was not under any load-therefore as both the 4gb and 2gb cards are based primarily on a similar architecture,i expected my 4gb GTX 960 to work similarly but unfortunately it doesn't,as I've said earlier.
I wrote to Zotac's tech support department in India about this issue and this is what they replied:
"GTX960 4GB…. Fan will not spin when the GPU temperature dropped below 38C and power consumption under 13W.
So it’s not a fault, please use your card. -Swarn Singh (technical manager)"
Zotac's official description for the freeze technology states that the fans are designed to stop spinning whenever there's no load-they dont mention anything about any specific temperature ranges when this is supposed to happen,so the explanation offered by this individual to account for the peculiar behaviour of this card don't seem very convincing-i hope he's not bluffing in order to cover up the fact that the card is faulty.
But I've observed that the temps of my 4gb GTX 960 always stay between 39-43 degrees celcius even when its idle,so in the odd chance that this Swarn singh fellow was telling me the truth,there's a possibility that this what makes the fans spin even when there's virtually no load on the gpu,but unfortunately there's no way to corroborate this hypothesis because i couldn't find any proof of this fact anywhere even after searching extensively on the web.
So I'm really confused about this matter as i don't understand whether the card is okay or not-if anyone else has faced a similar problem with their gpu then please let me know.