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How did you test your RAM? What program? How many passes? 8 is the recommended minimum.
Are you over clocking CPU, GPU or memory? If yes, reset everything to default and test.
You can also try a Clean Boot, see if the problem occur4s. If not then you know something that is starting at boot is causing it, so follow the directions to figure out what:
See here: How to Perform a Clean Boot in Windows 10 to Troubleshoot Software Conflicts