5950's have a lot of cores. 50c seems high, but if your full load is only high 60's low 70's I wouldnt worry too much about it. Also I agree with @sswilson that there is probably some default junk going on in your motherboard bios that could be raising temps, and preventing cores/ccx's from sleeping.
FYI, this is crazy! Idling away with Epic Game launcher open I'm at 60 C temps on CPU. I close it so it's running in the background and the temp lowers to 50ish C.
Now here's the kicker, I use Task Manager to end task and CPU temp goes down to upper 30's C.....!!!!!!!!
The above numbers based off of Aida 64. I just checked Ryzen Master and it shows my idle temps mid 30's C!
This pleases me
Epic Games Launcher makes AMD Ryzen CPUs run hotter even without any game running - VideoCardz.com
Game launcher caught making Ryzen CPUs hotter. Epic Games Launcher increases the temperature of AMD Ryzen CPUs, even when idle It appears that Epic Games