Alot of people are bashing hynix, and Micron, and glorify Samsung but noticed alot of those people own lower end cards like gigbyte, sapphire, xfx, vision tek, powercolor.
Don't kill me for saying lower end cards, essentially they are all the same but doesn't higher brands like MSI and ASUS use different hardware like capacitors, circuitry, etc...
I am only bringing this up because i had a 2 gigabyte rx580s, along with 2 asus rx580s they all had Samsung memory but only the gigabytes gave me issues every damn day.
My new MSI GTX 1060 6GB (ALL Micron Memory) is pushing +600 MEM & 50 PL without a single hiccup for 4 days of straight mining, each card at 23.125..... i will be pushing even higher in the next day or two.
Actually, out of all cards with Micron memory, Asus was the worst I ever had. Couldn't even stay stable at +350. While Gigabyte Microns can easily make +600 or more. Gigabyte with Samsung at least +750, some even up to +1000. Each card is different, even same model from same manufacturer.
And it seems you never had a card with Hynix. Even if you could OC a Hynix to +1000, hashrates are still shitty, because they have lower timings to begin with. Doesn't matter which brand you buy.
Hynix at stock ~15mh, max OC ~20mh
Micron and Samsung at stock ~19mh, max OC ~23-25mh
That's with Claymore 9.7, ETH only mode
Microns are not THAT bad, they are ok. Micron and Samsung have same hashrate, if left at stock or OC at same level. But most Samsungs can OC higher than Micron, that's why Samsung are the best. Hynix will always stay behind them both. I have a Hynix from Gigabyte which I can OC to +850 and run stable....still only 20mh.