BSOD Occurring Multiple Times Per Day (no singular cause)

Do you know what constitutes safe temps if I want to run the CPU stress test?

I tried to run Prime95 and the temps shot above 80 C within seconds. Would those temps indicate a CPU problem or would you need to have errors returned along with the high temps?

Does it make sense for a computer to boot and run for a time with a bad memory stick? Someone suggested that a bad stick would prevent the computer from running at all. I'm trying to ascertain if the problem truly is just a bad memory stick and not the motherboard.

Maybe this info is of some value:
Intel® Coreâ„¢ i5-4670 Processor (6M Cache, up to 3.80 GHz) Specifications

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I have now used my computer with a single memory stick for 4-5 days (not continuous operation) without crashing. Throughout the process, I have been hesitant to view this as a memory issue because either I have been very unlucky (I've had 3-4 sets of memory sticks with seemingly one failing in each set) or something corrupts the memory sticks (maybe PSU). Nevertheless, my computer is working now. I currently have 4 memory sticks. One seeming to be clearly bad, one working, and 2 brand new which are untested. I'll try my computer with each of the new sticks individually and then I guess the problem can be deemed "resolved." Thank you for all of the assistance provided thus far.

I have tested 3 different memory sticks by themselves for 3-4 days each without problem. I have also begun using 2 sticks for multiple days without issue. I consider my problem solved. Thank you all for the assistance.