Lowering frequency is often the right solution and I do mention it in the writeup. I couldn't find any up-to-date, accurate and accessible info on how to safely keep running with actually faulty DIMMs and it's not obvious so I thought people might find working instructions helpful.

If you're still wary of using some old 3200 stick you have and can't or won't RMA, please sell it to me instead of binning it :3