for most stress tests you want to test for 12 continuous hours, if you get that high that fast then your heat sink is at fault. stress tests test the stability of a system, if its not stable then you should do something about it. do you have a lot of air flw in your case, you might want to check that too
I'll definitely get a new CPU cooler, any suggestions?
Also, yes my case has 4 120mm fans, front, back, side, and top, usually running at full power if I play a game or something.