HI
Maby someone will know solution for my vegas 56. today I bought second used Vega 56. I have same identical model but my “new” card works only with MEM 835 or lower. this setting gives lower hashrate. I tried many amd mem tweaks, nothing helps. Can be card faulty ? Or maby should I try replace thermal pads…
I need some ideas 
I think I’ve tried everything…
I have 13 Vega 56s. All of the ones with Hynix mem get between 49.5-52 mh/s. My settings start at 1050 core, 800 VDD, and 950 mem. I use the following strap to start:
amdmemtweak --CL 20 --RC 36 --RP 11 --WR 14 --CWL 8 --FAW 12 --RAS 20 --REF 65535 --RFC 248 --RTP 5 --RRDL 6 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 12 --RCDWR 12
If I am getting too many invalid shares or teamredminer reboots, I decrease the mem by 5 for the GPU that’s having issues. Once I’ve reduced it by 10 (i.e., 940 mem), I also increase the RC and RCDRD settings by 1, so my strap would be as follows:
amdmemtweak --CL 20 --RC 37 --RP 11 --WR 14 --CWL 8 --FAW 12 --RAS 20 --REF 65535 --RFC 248 --RTP 5 --RRDL 6 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 13 --RCDWR 12
The lowest settings I have on any of my Vega 56s is 930 mem, 38 RC, and 14 RCDRD (these get 49.5 mh/s)
If this doesn’t work, maybe try flashing the bios from your GPU that works to your other one. Make sure to back up the bios in case it needs to be reflashed. You can do this from the console with amdvbflash or you can do it from the overclocking tab in hiveos.
I tried to flash didint worked Even when I put 825 mem it crashes. Now im using almost stock 805 mem clock and it works fine for few days…
And first vega suddenly crashed 
it does not work I sent for reball.
How long you re mining with those vegas?
with vega video cards i am unlucky 
.
So I tried
with 940
amdmemtweak --CL 20 --RC 37 --RP 11 --WR 14 --CWL 8 --FAW 12 --RAS 20 --REF 65535 --RFC 248 --RTP 5 --RRDL 6 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 13 --RCDWR 12
didint worked
amdmemtweak --CL 20 --RC 38 --RP 11 --WR 14 --CWL 8 --FAW 12 --RAS 20 --REF 65535 --RFC 248 --RTP 5 --RRDL 6 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 14 --RCDWR 12
mem 930 didnt worked
-CL 20 --RC 40 --RP 11 --WR 14 --CWL 8 --FAW 12 --RAS 20 --REF 65535 --RFC 248 --RTP 5 --RRDL 6 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 16 --RCDWR 12
mem 910 didint worked
I’ve been mining with 13x Vega 56 and 11x Vega 64 since March/April 2021. 19x Powercolor Red Dragons / Red Devils, 1x Sapphire Nitro+, and 4x MSI reference cards (with the Morpheus Vega II cooling system). Never had any major issues with them. My lowest hashrate on a Vega 56 is around 50.
You could also try flashing it with a bios for an MSI reference card. Some people use the MSI reference bios on GPUs that are not MSI.
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