I'm finaly back for some updates : my testing mobo went dead and fortunately i finaly received the asus B250 (ordered like last year 
nothing extreme https://ibb.co/gmmC7G as I said 16 others works just fine !
Your memory OC is probably too high for this specific GPU. Dial it back to 935 and see if it hashes without failure then work your way up slowly.
thanks it was exactly the issue !!! I lowered the mem clock to 1050 and it's just smooth and stable !! Thanks a lot it was almost rma state
I managed to install another vega 56, this one, with a damaged cpu crystal !! but still getting 1900h/s when a litle bit overlocked goes up to 2100h/s
but not for long and just get stucked. But stil happy that it works.
Thank you very much the issue is solved.
Happy new year
Odd...how much did you overclock?
Paste OverdriveNtool.ini or your settings for memclock etc.
Paste OverdriveNtool.ini or your settings for memclock etc.
nothing extreme https://ibb.co/gmmC7G as I said 16 others works just fine !
Your memory OC is probably too high for this specific GPU. Dial it back to 935 and see if it hashes without failure then work your way up slowly.
thanks it was exactly the issue !!! I lowered the mem clock to 1050 and it's just smooth and stable !! Thanks a lot it was almost rma state
I managed to install another vega 56, this one, with a damaged cpu crystal !! but still getting 1900h/s when a litle bit overlocked goes up to 2100h/s
but not for long and just get stucked. But stil happy that it works.Thank you very much the issue is solved.
Happy new year