Palit 1070 fan pulsing

[Goose]

I got my Super Jetstream today and i'm pretty happy with it but it's doing something extremely irritating. After its been under load (even for just a few minutes) the fans will start to pulse and depending on which monitoring software i use it will report the fans speeds at anything from 2% - 10%. That figure will remain constant despite the fact I can clearly hear it pulsing and its loud enough to be really, really annoying.

Is this a bug of some sort or a weird cooling-down period?

 

[Deleted member 2277]

I've never noticed my super jetstream doing that and I've not read of any doing that either.

 

[Aretak]

Both my Palit 980 and 980 Ti did it, although I never really found it annoying. It's just the way the fan controller handles really low fan speeds. The fans spin pretty slowly even under full load, so there's likely not much headroom in terms of cranking them down smoothly towards a low RPM, given most fans have a lower limit as far as that goes. I guess their solution was just to use short bursts for really low fan speed percentages, rather than the fans simply stopping at, say, 25% and anything below that being meaningless (something I've encountered on many cards that disable the fans at idle, with anything below a certain fan speed percentage just being "off").

You can observe the behaviour in this video, with the pulsing happening both at the start as the card's warming up and at the end as it's cooling down.

You could probably skip that phase entirely with a custom fan curve by determining exactly what percentage the fans come on fully instead of pulsing, and set the curve to go straight to that speed from 0% at your chosen temperature threshold.