Try the other bios switch setting and see what it does
where can i find the other bios?
Flip the micro switch on the card. Between the 8 pin plug and hanger.
I Found 2 switches - on/off - i think its the light
and red/blue … is this the bios? … no idea 
didnt find more switches
i´m blind - i found this well hidden small thing
but not its shown as vega 64 and no more 56
and only 22mh on eth mining … no effect with oc - same as before, only lower hash
Have you bios modded it yet?
Well, I ended up raising the RCDRD to 14 and combined with the other settings it greatly improved the invalids but still getting them.
After 24 hours I ended up with 10 invalids on the problem card, nothing on the other one. I am testing upping the RCDRD to 15 now. Hashrate has dropped due to this of course, sitting around 54mh.
Should I just keep raising the RCDRD or is there another setting I should try changing to prevent invalids / improve hashrate? 55mh/card would be great I think.
Thanks again for the help.
Basically, yes. This is the best way to test the hardware faults. Track it down until you have 0 over 24 hours. That’s what I’ve done with mine. Some can’t take that high mh. I’ve dialed some down a good bit, but my rigs are stable 100 percent of the time.
My first question was, if i only need settings or have to mod something 
So its clear i didnt do anything for any mod.
They only told me about that switch on the card … that changes nothing
Can you pls tell me where to find a guide for modding (i think bios?)
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I can just tell you what to do step by step.
First, know the make and manufacturer or your card.
Second, go to www.techpowerup.com and find the bios for your card. It is always safe to go with an AMD bios, as they cover all Vega 56 cards.
Third, make sure your miner is NOT mining. Go to the “cards” tab on your farm homepage, and locate the card you wish you bios mod.
Fourth, click on the link that says “VBIOS ROM Storage” which is right next to the link that says “Cards”.
Fifth, upload the bios you just downloaded from techpowerup.
Sixth, click on the 3 dot haptic next to the card you wanna bios mod, and click “Select VBIOS”.
Seventh, click both of the round button haptic at the bottom that say “Reboot After Flash” and “Force flashing ignoring security checking”.
Eighth, click the “Select” button that displays the bios you uploaded.
Ninth, click on the button that says “Flash Cards”, to the right it should say “1 prepared to flash VBIOS”.
And then you’re done. The card will read as whatever manufacturers bios you uploaded, so it’s good to remember the original bios and have that as backup.
But that’s the process! Vielen Glück!
Thank you @Mushugana. Your settings worked perfectly fine for me. I’m getting exactly 55.04mhs on my Vega.
Cheers from Brazil!
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@Weiler thanks. If you don’t care about electricity costs you can raise the core some where between 1100-1200 and get around 56-58 M/h depending how your card maximum core setting is before it crashes.
Start with basic settings. There is no mod for Vega cards. You will need to 1-tweak the overclock settings and then 2-amdmemtweak settings those are your mods. I would start with a fresh flash of the bios for your card from tech power up. Read @KosherMiner post it is spot on for the bios flash. If the bios flash doesn’t help. Get the AMD bios for card and try that one. See if there is a change. If you can’t get the board running better then you lost the silicon lottery. I hope you get it going.
Alan
Hi there!
Thank you for the info, how far can we go with the memory clock?
After 15 hours, no incorrect shares. You think we could try 1050?
damn - i look the pictures a third time and see the switch middle position for oc … i didnt before ^^ i only switched left or right.
no i need to try with middle position, then i will tell you
@Mushugana, hello again!
Since yesterday, it started to get too many invalid shares, almost 1 per hour.
What settings do you suggest to change?
Thanks.
Start tracking up your rcdrd. Do you run it in high sample mode to check for errors at a faster rate?
How high should you take the RCRDR? I am up to 16 and things don’t seem to really be improving from 14. Still getting 1 invalid every 2-3 hours.
Is there another setting that I should try changing?