Quote from: Branko on January 16, 2018, 06:22:27 PM

Quote from: fapar on December 13, 2017, 07:21:11 PM

Quote from: condemor on December 13, 2017, 07:01:22 PM

Hello everybody. I have a Sapphire RX 580 4Gb, with modded BIOS (including memory timings) and overclocked until instability (1050/2020). It run under windows 10 with mining drivers, and Im having arround 25,5 Mh/s. I tried a lot of things trying to reach the "oficial" 30Mh/s that these cards are supposed to make. I even change my card for another one, but the hashes remain the same. After reading the experiences of several people with my same card and same hashes, i realized that 25 Mh/s are pretty OK for this card.

Now im thinking about building a dedicated mining rig with six Sapphire RX 580, and i wonder if the 8Gb version will reach more easily these "oficial" 30Mh/s

Thank you very much in advance for your help.

Higher hashrate depends on the memory manufacturer. Samsung best of all, Hynix/Elpida worse, Micron very bad. A good memory can keep the frequency of 2100+ which has a positive impact on hashrate.
When choosing a card should be based on the memory manufacturer.
This is not a guarantee of high hashrate, but as close as possible to him.

micron is not "very bad" but up there with samsung, the best

Quote from: Deathwing on December 13, 2017, 07:49:06 PM

Higher is always better. Also not to forget that DAG size will continue to increase which means 4GB cards will not be able to mine ethereum after a certain period, for memory I heard Hynix is the most common and average performer.

Yes, sadly 4GB will stop hashing ETH in april, 2021...but somehow, I think both 4 and 8GB versions will be obsolete by then, anyway

Saphir Nitro + RX580 8G Micron 31.4 Mh/s in HiveOS.
Saphir Nitro + RX580 8G Hynix 30.7 Mh/s in HiveOS.
Saphir Nitro + RX580 8G Samsung 30.5 Mh/s in HiveOS.

On Windows you have to add ~0,5 Mh/s on my result.

all around 100W. Try different timing from Uber Mix on Samsung and no chance at all.

It looks like new Samsung on RX 580 are not the best anymore.