once you found your max stable mem, you can try do decrease rcdrd step by step; this should keep you busy for the next few days 
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Runra and Oni,
i have one model of MSI Vega56 flashed with the bios of the saphire model
the straps are
and the result is
when i go above 955/960 the card crash invalid
Yes, that’s normal. Hynix memory doesn’t go as high as Samsung memory.
You can try lower the rcdrd for better hashrate.
Here my sapphire 56 hynix values, you can try if your card can take these
amdmemtweak --CL 20 --RC 36 --RP 11 --WR 14 --CWL 8 --FAW 12 --RAS 22 --REF 65535 --RFC 248 --RTP 5 --RRDL 6 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 12 --RCDWR 12
If crash change RC to 37
mem 960 vdd 830 core 1050
so could’t resist when i got an opportunity to aguire another vega. Radeon 56 ref, bit of issues when i added that to rig, ended up flashing hive again and after, all issues gone. Seems like a good gpu, i can understand now why some of u guys have whole rig full of these 
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#EDIT#
Below was a test on Samsungs, but due to lack of sleep with wrong straps to begin with, hence I couldn’t get their mem clocks higher. The test is thus not so relevant. Take from it what you want.
#/EDIT#
I’m experimenting a bit with the SOC Frequency field in the OC screen. It sets the SOC state of our GPU’s.
The normal Vega 56 SOC states are :
- State 0: 600
- State 1: 720
- State 2: 847
- State 3: 960
- State 4: 1028
- State 5: 1107
Mem state and SOC state are linked. If you set your memory clock to 940MHz, the SOC state will set to the state right above, so 960 in this case. If you have mem 1020, SOC will set to 1028; if you have mem 1028 it will not set SOC to 1028 (that’s not above but equal) but to 1107.
I have now manually set some of my Vega’s one state higher in the OC screen, so for mem 940 I have not set to 960 but to 1028; for mem 1020 I have not set to 1028 but to 1107; those who were already SOC 1107 I left alone.
I can already tell that all those that were set to 1107 didn’t last long; they crashed pretty fast.
But all my GPU’s with somewhat lower clocks between 900 and 950 for which I have set the SOC to 1028 are running for 24h now without rejected shares (as they did before), AND each with a few tenths of a MH/s higher!
So although it doesn’t seem work on the high frequency Vega’s, it is another way to squeeze some lower frequency ones 
Needs more experimenting though.
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This is also the reason why we see bigger jumps in MH/s when we go from for example mem 950 to mem 960 as it automatically jumps from one SOC state to another, from 3 to 4 in this example.
Hashrates don’t jump that high when you set mem from for example 940 to 950 or from 970 to 980 as those stay in the same SOC state 3 for the 940 and 950 or state 4 for 970 and 980.
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have u noticed difference in w consumption on those gpus that u have set soc value?
this is interesting!
but my Hynix GPU 2 was SOC 960 with Mem set to 960, what did you have core at when testing?
I just put @Smining570’s Hynix Strap on it but set mem to 940 and its only running .1 mh lower than 960 mem.
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yes, this i have noticed, in certain range there is no benefit for higher Mem…might be that only loose some stability with higher mem due related strap value set to tolarate that higher mem… and looses some mh in the prosess?
Well spotted! 
looks like mem 940 will allow --RFC 239 and that brings hash up a bit, for me its 52 with --RFC 239…just tried so long term will see later.
Nice one from Oni, we just discussed abot those states with Silver yesterday. Well done
edit. hynix with Mem 940 vdd825 Core 1050. 52mh stable for +24hrs. possible to go for higher Core with straps mod but rather stable 52 mh than any issues with 53-54.
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Thank you for this @oni RCDRD 19 was the proper value for one of my Hynix, I had problem with many ivalids with 18
Im using sapphire nitro plus vega 56 with hynix memory. I get few HW errors per day
using this
amdmemtweak --CL 20 --RC 36 --RP 13 --WR 13 --CWL 7 --FAW 12 --RAS 23 --REF 65535 --RFC 248 --RTP 6 --RRDL 5 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 18 --RCDWR 11
960 memory at 812 voltage core 1075.
Should i be worried about those HW? getting around 49mhs.
at rcdrd 20 i got 1 HW after 12hrs. or maybye someone has straps or oc that would work better?
##editedit##
Try the same settings with mem 940. If I go above 940 with my Hynix this doesn’t change hashrate. BTW a few invalids per day if nothing 
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hey. how is frontier edition vega performing, thats 16gb, right ??
hey, have u managed to tune those ?
U could try to gpu 0 &1 mem 1020 / vdd 820 / core 1130
straps
amdmemtweak --RC 37 --RP 12 --WR 13 --CWL 8 --FAW 12 --RAS 22 --REF 65535 --RFC 239 --RTP 6 --RRDL 5 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 12 --RCDWR 12
For gpu 2, the hynix one,
try mem 940 / vdd 820 / core 1050
straps
amdmemtweak --CL 20 --RC 36 --RP 11 --WR 14 --CWL 8 --FAW 12 --RAS 22 --REF 65535 --RFC 239 --RTP 5 --RRDL 6 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 12 --RCDWR 12
Hope these works for you, good luck
Yes sir, ive got it mining at 41.
My 2 Hynix cards can’t start with SoC set to any of 960, 1028, 1107. I have mem set to 940.
Hello guys!
Im new to mining and I’m not sure if this is the right thread to ask for help. If not, please point me to right direction.
Equipment:
MB: h110-d3a
Corsair RM1000X
Vega 56 x 3
RX480 x 2
My problem is mixing Vega 56’s with my RX480’s. Everytime i try to mix them, the Vegas wont mine at all. They are detected but only the RX480’s will mine. And when i remove the RX480’s, the Vega 56 will begin to mine(then the rig only includes Vega 56 x 3). I have tried changing risers, different powering to riser(molex and 6pin, no SATA), just 1 x Vega and 1 x RX480(if power consumption problem) but nothing works. Also different PCIe Gens(auto, 2 and 3) from MB Bios settings.
I have also tried different miners(Bminer, TRM, phoenixminer). Same problem also occured in RaveOS. And also adding GTX 1070 to the rig stopped the Vegas from mining.
If you have any tips I will gladly try out them.