To low hashrates for RX 570 Expedition OC?

[Sanalup]

Hey Guys!
I have a Mining-Rig inside a 19" Server-Case. Inside that Case i have 6x RX 570 Expedition OC from Asus and i'm using claymore-eth miner in version 10.2 but i got two problems:

The first one: My Cards are at 18 - 19MHs but as i've found out via google they normaly should be at 21 - 22 MHs. I'm Using the Crimson ReLive Mining Driver 17.30.1091.1011-170922a-318486C. 4 Cards are at 70 Degrees Celsius and 2 Cards are at 63 Degrees Celsius. How can i bring them to 21 - 22MHs and am i doing anything wrong?

The second one: I'd like to overclock the two "cold" cards via MSI Afterburner. I put the powerLimit to 50% plus, CoreClock to 1350Mhz and MemoryClock to 1950Mhz - but nothing changes. GPU-Z recognizes the changes, but the temperature does not get higher and the hash rate also not - do i have to do anything else?

Hope to hear from you Greetings!

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[1715117080]

1715117080

[dragonmike]

You need to mod the bios of those cards.
I've got 14 of these exact model RX 570's and they hashed ETH at ~28MH/s while dual-mining DCR or LBC as well.

Contact Mattthev on these forums, he's got a collection of BIOSes that'll work for your cards.

[ikicha]

Come to try Mod bios for rx 570
I Have 2 RX570, normally without OC and without bios mod, i got 22 MH/s for ethash mining
After Bios mod without OC, i got 26 - 27 MH/s for ethash mining
How to modificate bios you can search thread on this forum or browse at Anorak.tech

[Sanalup]

Tried to flash the bios with the one from anorak - elpida powersave 1750 - system is frozen now since 5 min... should i do a restart? :/

Got 6 RX 570 Expdition OC and just flashed one actually to test it. Every PCIeSlot  is on Gen1

[Cereberus]

Tried to flash the bios with the one from anorak - elpida powersave 1750 - system is frozen now since 5 min... should i do a restart? :/

Got 6 RX 570 Expdition OC and just flashed one actually to test it. Every PCIeSlot  is on Gen1

Easiest bios mod can be found in this video here, just get polaris editor version that supports RX 570 4GB cards, I will post my bios modification when I will do mine Sapphire Pulse RX 570 4GB and will put here for anyone who may want them. Meanwhile follow this video as it cover all aspects what you should do to easily modify your bios even if you are a total noob.

https://www.youtube.com/watch?v=JKM60VVIfRg&t=