Everyone watches youtube videos, those run on high power consumption on AMD hardware too.
A friend was using a PC with R9 390 for photo editing (Adobe Lightroom mostly - it can utilize a GPU). We didn't check the power consumption, but you could actually hear the fan speed up. This is not happening with NVIDIA cards - they can do quite a lot keeping very low power consumption and heat.
I've created a
thread lately about the passive cooling in idle feature of modern GPU (actually you gave the last answer in it
). I wanted to learn just how much you can do without waking up the fan.
I've asked around since then and finally found both RX460 and 1050ti in the ASUS STRIX variant. Sadly, the cases were very different, so it's not easy to compare the two, but the general feeling was that you really need to run a fairly modern game (or long gpu-heavy calculations) to wake the fan up in 1050Ti.
RX460 started spinning way earlier - even in some very old games (totally playable on Intel IGP) or running very simple GPGPU scripts / software.
We didn't have a second LCD on hand, but based on above experience and RX460 reviews I've seen, IMO it is possible that 2 high-res screens - with a video on one and productivity software on the other - would already need the fan. That is... weird, really.
I don't know the reason for all this. Maybe it's because AMD is so concentrated on gaming lately (check Ryzen...). Maybe the drivers are optimized for quick boost rather than keeping things steady for as long as possible.