It will not completley stop the test, but it will stop on whichever core gave you an error.
Generally if you run Small FFT or Large FFT, it means you need more CPU voltage. However if you run Blend, then it might be RAM so that's usually a test saved for last.
I prefer Linpack tests though, more sensitive to errors. I use Intel Burn Test, but I think OCCT is a good one for AMD CPUs. You can run small RAM usage for mostly CPU stress (20-25 runs) or full RAM usage for mostly RAM testing (5-10 runs). That's what I like to do, mostly because I don't like leaving my PC running full speed for so long. When I first got into OCing though I did the Prime95 overnight thing.
Honestly, if it passes the Large FFT test for more than 2 hours, it's probably stable enough. There have been times when I've tested for 12+ hours in Prime, completely stable, but it BSOD'd watching a YouTube vid, so it's not foolproof, but 9 times out of 10, 2 hours will be enough.
I just use Intel Burn Test run 100 test if it passes it's stable i have my i5 2500k @ 4.8ghz 1.384V i have had it that way 24-7 for a few months now make sure to monitor your temps P.S.I don't recommend you run yours 24-7 that way i am using a custom loop so it's fine for me because my temps are 61C on full load