Hmm, I wonder if we see, now since we are in a RAM availability crisis, more borderline to bad RAMs creep into the supply chain.

If we had a time series graph of this data, it might be revealing.

If you look around you'll see people already putting the new, chinese made DDR4 through its paces, it's holding up far better than anyone expected.

Every single time I've had someone pay me to figure out why their build isn't stable, it's always some combination of cheap power supply with no noise filtering, cheap motherboard, and poor cooling. Can't cut corners like that if you want to go fast. That is to say, I've never encountered "almost ok" memory. They're quite good at validation.