Comment by Panzer04

SK Hynix is winning in DDR5 land - their memory performs significantly better in all respects compared to Micron and Samsung.

Whether that matters much is debateable - maybe they get higher yields as a result (since more chips are sufficiently performant to be useful) but JEDEC specs seem pretty generous relative to what you can achieve on consumer platforms, so I somewhat doubt much RAM is thrown out because it's too slow to meet spec.

It's pretty random, though. Back in DDR4 days Samsung produced the best memory (B-die) and it wasn't particularly close - near-DDR5 speeds with lower latencies. At the same time, some of their other dies (I guess from other fabs?) was absolutely awful.

Again, I don't know how much that translates into profit though, since the performance user market for RAM is probably a fraction of a fraction of the overall memory market.