Re: GPU idle at 50 degrees.
I'll mention something that - according to the HWinfo screenshot you posted - isn't happening to you but as you're interested in temps and you say it "idles at 50" could be of interest.
If a GPU pretty much constant at 50 degrees (literally
49/50 degrees), there is a 'thing' it might be doing that isn't a problem but can irritate some people.
If I recall correctly, 50 degrees is the threshold for idle fan stop on some graphics cards - the feature where the GPU's fans turn off when the GPU is on low loads in order to cool the card passively just with the heatsink.
A behaviour you can sometimes see happen is the cards appear to get 'stuck' at 50 degrees.
This usually happens because although the card is on low load, something is preventing the card from reducing its frequencies. Usually software with some kind of GPU acceleration, which could be a game client or a web browser. This means that although the GPU is doing hardly any work, it is unnecessarily maintaining its full clock speeds, which produces more heat. Not loads more, but a bit more. Enough to push the temps over 50 degrees. At which point the fans turn on and cool the card back down to under 50 degrees almost instantly. And so the fans turn off. And the card's temps rise to just over 50 degrees, and the fans come on again... and so on.
This isn't a particular problem, though could be an irritation if you hear the fans go on and off.
If you suspect that's happening, check your GPU frequencies on idle, when you are getting 50 degrees temps. If they are high, this could be what is happening.
GPU-Z is a handy tool for this, as it conveniently shows GPU temps, frequencies, and fan speeds with both numbers and a graph showing the last short period of time. It gives a handy visual representation - e.g. if the fan speed graph keeps going from 0 to a few hundred rpm, to 0, and so on.
If you open Nvidia control panel, on the menu bar at the very top of the program is "Desktop" under which is "display GPU activity icon in notification area". Check that and you'll see a new icon in your system tray. It will list the applications using the GPU.
Close them until you notice the GPU frequencies drop down to (probably) a few hundred Hz.
Again, 50 degrees on idle is entirely safe for the GPU. It might just indicate that it's not downclocking (which isn't dangerous either, it might just bug you or use a tiny bit more power than necessary).
Your HWinfo screenshot shows low frequencies, temps below 50 degrees, and the fans on 0rpm. So that doesn't seem to be happening to you. Just mentioning as you might find of interest