Question Rendering device has been lost

Jul 9, 2019
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Hi there,
so lately i've been experiencing crashes on certain games, usually when graphics are more demanding.
The game will suddenly freeze up and the screen will go black. in overwatch for example ill get this error:
img_5a813a79d32bb.png

system specs:
8700k (stock settings, cooled with corsair AIO)
1080ti, currently set to default settings, i also tried reducing the power target to 90% which helped for a while but still got crashes occasionally.
corsair hx1000W PSU.

i've tried all the fixes in this guide, still to no avail.
ATM i think its either the GPU or the PSU but i really dont know how to confirm my suspicions.
some more pics:
GPU Tweak screenshot of the moment of crashing (i should mention the GPU temperatures never go over 65-68 degrees)
event viewer error
and another

i would very much appreciate any insight and help, thanks.