Well, Samsung, Elpida, Hynix, all of them is fine.

But I bought a RX470 that is making me to lose the hair (lol). Apparently it comes with a Micron low clock ICs. It doesn't run at 2000+ even with loose timings. With reasonable timings, I can run without issues between 1900 and 1930, but I can only reach 910H/s CN-V7 and 1000H/s CN-Heavy/Haven (at 1150/1920). Isn't a powerful result, right?

Wich timings I have to reduce/increase to improve performance in CN variants (maybe Ethash, but isn't the focus), considering the clock is a hard limitation? I have a little list, but I think is far from a complete list:
ACTRD/ACTWR, RASMACTRD/WR, TRCRD/A

But I'm not getting conclusive results. Is a painful pleasure to optimise it.

Is there another timing that I'm forgotting to change?