Hello Guys,

Recently I have built 8GPU VEGA mining rig. The rig contains: 5*MSI Radeon RX Vega 64, 8GB+2*Gigabyte Radeon RX Vega 56 8GB+1*Gigabyte Radeon RX Vega 64 Gaming
OC 8GB Video Card.

except the HBM problem, i had another problem when I was mining GRAFT on certain pools. some times, the pool will reject all share with reason "Unauthenticated".  please refer to the log below.  And the rig will be stuck in this status forever until a reboot.

[23:38:40] GPU2 | 52øC | Fan 4002 RPM | 1927.2 H/s
[23:38:40] GPU0 Found Nonce, submitting...
[23:38:40] !Rejected by pool! Reason: Unauthenticated

To address this, I developed a monitoring powershell scripts to monitor the accpeted shared by pool. if shares are not increased in 2 minute, then the rig will be rebooted.

it works pretty well since it also address another problem i had, some times rig will be doing nothing if one card is not hashing.  

I am not a professional powershell developer. This was my first time to use powershell and I developed this script one night with the help of google.

Here is the link for your reference in case you are having same headache.

https://drive.google.com/file/d/1aJCE6kAZawQ_Mi9NQ-JnW0xJtuoqRiSO/view

I noticed GRAFT coin from easyhash pool and it seems very profitable now.
The mainnet is online less than one month.

I read the white paper. And it seems pretty good project. The project is solving the payment issue on the pos (point of sale).
And all the transactions are instant authorisation which is like our visa credit card.

They did not invent new wheel and they achieved this by fork monero + all dash master nodes.

I will switch my hash power to GRAFT now.

A very well build card but i cannot mod the BIOS.

I simply copied timing of strap 0:1500 to 1625/1750/2000.

After reboot, in windows 10 device manager, I got this error:  
"Windows has stopped this device because it has reported problems. (Code 43). "





Driver: win10-64bit-crimson-relive-beta-blockchain-workloads-aug11
It is patched by atikmdag-patcher-1.4.5
win 10 pro 64 bit

I can recover the card by flash the original backup BIOS.
I tried a couple of times, but the result is same.

HELP NEEDED.