Those temperatures are high; others here should note they’re Celsius not Fahrenheit. When idling or with little stress 50°C, except in a very hot climate (40°) and little air circulation, is much higher than I’d accept. Above 85°C can damage components if that occurs with any regularity.
My, admittedly, non-gaming, PCs stay at around 40°C during normal use even under stress with the CPU at 80%+ rarely peak higher than 55°C during the hottest summer days here (UK – 35°C).
So with no other evidence of what it might be, particularly if you’ve no historic record of what is normal for your PC, those temperatures are what I’d be looking into.
I’d check that all the fans, especially the CPU heatsink one(s) and the GPUs own fans are spinning up correctly. I’d also check, carefully, that the CPU heatsink is still firmly seated.
If the PC’s ‘power plan’ is set to high performance I’d look at the system cooling policy settings are ie. if they’re active or not. I’d go into the BIOS too and see if shown what the reported temperatures are there and if any are obviously higher than the others.
Check if the fans are set to a limited PWM setting (some MBs allow you set it 75% to reduce system noise) and maybe reset that and see if it makes a difference.
I’d also do all this:-
Do you think that your CPU is too hot? Have you ever experienced a full system shutdown right in the middle of playing a video game? This could be caused
www.wepc.comFinally I’d suspect the GPU might be involved, so if its fans are spinning up OK and there’s nothing obviously wrong, then I would try bypassing/disabling that temporarily, swapping the display output to the MB’s connections. Obviously you won’t be able to play most games but if the crashing still occurs then, at least, it would indicate it is not the GPU causing the problem.
The PSU, as ^ suggested, could still be involved but how you’d test that without having a replacement available I don’t know.