Hello everyone,

I have 6x XFX RX580 8GB all with Hynix memory. Out the box they hash at about 22.1-22.7 MH/s. I updated the drivers to latest. I am testing two cards in my gaming pc until the TB-250 gets here. I have tried to under-clock the cclock and it does not affect the hashrate so pretty sure I'm good there. But in trying to overclock the memory, I put it up to 2050, and I drop to 19.5 MH/s. Only on the first card, GPU0, the second card typically doesn't get affected. I am doing this with the AMD settings desktop app. I tried also with MSI Afterburner but same results. Played around with under-volting and got decent power consumption drop.

Finally I patched the drivers, loaded up ATIWinFlash and modded bios(flipped switch on GPU toward rear) by copying the 1:1750 timings to the 1:2000 timings. Saved and loaded and still same hashrate while same situation as far as overclocking while dropping in MH/s rate.

If anyone can help it would be greatly appreciated!!

So I just need a bit of help. Essentially, I can get a couple of different cards. It's between 3 different versions of the RX580 or  RX570. The costs are for 6 GPUs. Either $1536, $1377, $1108 for the 580s or $1062 for the 570. I'm worried mainly about getting the best memory on it, like samsung or hynix from whatnot have seen. But also the differences between the actual cards themselves.

Does the core clock really matter? I understand undervolting and overclocking.

Thanks in advance!!

So, I have a question for anyone that can help. I can get my hands on XFX RX480 and 580 8GB. Worth it? Otherwise I can not find these cards anywhere.