If you want to build a new system, then go ahead, but I wouldn't say were there yet. As trents pointed out, after overclocking a system for some time, it can no longer be presumed to be stable at stock.
I would recommend first first a fresh win10 install.
Second stress test prime 95 small fft to check CPU and custom blend using 12GB of memory to test memory. If you can pass both of those, then you can presume that the hardware is stable at the stock settings, and we can start looking at further diagnostics.
You're never going to find a definitive response just by posting symptoms. You'll get suggestions for diagnostic steps (like stress testing or running one stick of RAM), which could lead you to a definitive answer, but that's how trouble shooting works. If you come onto a forum and someone replies, "it's X part, replace that" it is probably just a guess, unless there are very specific symptoms.