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Prime95 is not a good software to test a cpu. By the way there no good software to test cpu, it is only a matter of probability. Potentially you have a bad (or more transistor) in the middle of 1 billions ! You could run lots of program in your life without encounter any issues.
The best and only way in my opinion is to try the dralor suggestion. Go back to 2 cores mode (if possible and do a test)
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prime95 is fine for cpu testing when you adjust the memory access patterns as well to also test memory properly.
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If the 4th core can be unlocked it's fine. It's just a normal 4 core CPU that had one of it's limbs chopped off cuz AMD needed more 3 core cpus
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There is no die difference between a quad core with a locked bad core and a quad core with locked good core. You have no guarantee that the unlocked core will be good.
