Thanks! You solved it 
Good to know!
Please also share your results after the bios change so we know the difference.
Hi, what timings do you use for vega 64?
You’re again at the max wattage of 165W.
You’ll need more efficient straps if you want to go higher in hashrate.
Plenty of straps to test in this topic 
I have good results with these:
amdmemtweak --RC 36 --RP 11 --WR 14 --CWL 8 --FAW 12 --RAS 20 --REF 65535 --RFC 248 --RTP 4 --RRDL 6 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 10
But not all my Vega’s accept it. If it works for you, good, otherwise try different straps to find the best one for your card.
PS: some other stuff to think about for those that are running bigger rigs.
I don’t mine at max hashrate but around 180MH/s as my 13 Vega rig pulls ~2400W from the wall on a 10A fuse at 240V, so I shouldn’t go higher or the fuse might blow (10A x 240V = 2400W).
If I want to go higher, I need another fuse box. My electric wires are already 2.5mm² so should be able to run higher.
My 2nd rig and my test rig run on a separate 10A fuse.
Don’t go over your electric limits or your house might burn 
You’re better off flashing it to a 56 bios and apply the 56 straps.
Got that strap on 5 vegas that all run great and one card that throws occasional invalids, tested with RC 37 still got invalids so trying out RC 36 and RCDRD 11, will let you know how that runs.
@disaster1 I would add to that, turn down the memory to 880, maybe 846 and drop VDD as much as you can.
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Bought a new Vega 64 today(GPU5)… nothing special, but damn these are getting hard to find 
Another Power Cable warning before I post this.
I am using 2 8pin to 8pin psu cables please do no try this if you are using a splitter on 1 8pin cable.
2 8 pin cables can carry 300w, and to be extra safe I assume I am pulling 1.3x what hiveOS reports so theoretical “safe limit” for power reported in HiveOS would be like 230w.
This makes it interesting for 3 types of Vega 56s The Rog Strix and Red Devil have a power cap of 260, Nitro + has a 240w max.
I think 217Mh is about the max you can get with 1027 mem, I tried pushing effective core all the way up to 1580 and it was same hashrate as 1540.
amdmemtweak --CL 20 --RC 37 --RP 11 --WR 14 --CWL 8 --FAW 12 --RAS 20 --REF 65535 --RFC 248 --RRDL 6 --RRDS 3 --WTRL 9 --WTRS 4 --RCDRD 12 --RCDWR 12
Will update if I can keep it up for 24 hour with these settings, i think it will need a little more vdd
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Hi guys, just registered to thank you all, and share my little experience.
I just started using hiveos from scratch with 3 vega64, 3 different ones, a gigabyte Liquid cooled, a gigabyte goc and an asus strix.
I managed to convert the last 2 to vega 56, the liquid cooled one not yet, i read here you can flash the reference one, but there are several and i dont know witch one, anyway, i managed to push the asus one to 190mh, and gigabyte to 166mh, the non converted one gets stuck to 148MH
to the point, this consumptions, as mentioned here several times, are totally fake, so i was curious and i tested the real watts of my two converted cards.
Riser and card isolated into a separated power supply and measured, the power supply is a Bronze one (platinum is used in the rig, this one was the only one i had laying around, so some watts wasted here)
ASUS STRIX:
Hashrate:190MH
Reported consumption: 140W
Real consumption: 200W
Gigabyte GOC
Hashrate: 166MH
Reported consumption: 165W
Real consumption: 185W
I’m planning to test the vega 64, to see if the consumptions are more realistic but now i’m moving the rig, it was getting too hot where it was.
Edit: btw cards’ fan speeds are very noticeable in the wattage
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Me podrías pasar la configuración?
Interested on your definition of too hot - your fan speeds and temps make me very jealous! Great work, and i find it funny we both arrived to the same settings / mh for the gigabyte even though i cannot find anywhere they are posted. And yes, any reference AMD (NOT branded) bios for vega 56 air cooled will work for LC, that is what i did. YMMV but I did my mod in DOS not HiveOS. I suspect their wattage draw is atrocious though
Well, I had to close all the windows on that room (a LOT of dust was getting in from outside) and I moved the rig before it was too hot. Now I have the fans at even lower speeds (I want to test the difference that makes to the wattage)
There are 3 non branded reference bios, i will take the most powerfull, 165w (seems pretty low)
BTW, If i find enough cards to fill my rig, the gigabyte one will go bye bye
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I dont have a link but there is a power cable guide out there that recommends one 6 pin for the riser and 1 6 pin with splitter for most standard AMD GPUs, but SPECIFICALLY mentioned using a total 3 6 pin minimum for vega for this reason. Uses a lot more than it says, would never used less than 3 cords total for a Vega to supply 225W. 90% sure ive seen most vega 56 bios are about 230 TDP but surprised to see yours is 260W for a 56. NOTE: To readers, he is talking 8 pin and i am talking 6 pin. Difference between server PSU and ATX PSU. Im not worried about HiveOS as it really cant have drivers crash, but if I use Windows I will likely have to check bios TDP or up to 2 8 pins minimum.
EDIT: Reason I am more worried about Windows is your overclocking tool can crash while the miner doesnt, and cards will default to pulling TDP over taxing your cables. Thats a safety hazard.
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Same for the gigabyte. One other huge drawback is they crash very easily, and usually mine gets a thread stuck and can only be reset by a hard reset. So more power, less stable, and lower hash. Now, on windows, i have READ that you can use W8200 (vega 56 professional) drivers and it makes them run much better. Havent tried it yet but will soon though. I am not proficient enough in HiveOS to know how to do that there.
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Did you manage to get it more stable? I followed exactly what you put down and I was able to get it to 165.1mhs. Occasionally it drops to 150mh, does this happen to you? My Nvidia cards never flutate that much on hiveos.
Also, completely nub question, but vvd = memory controller voltage on hiveos right? I’ve always mined in windows until now.
fluctuations are indeed normal; it depends on the miner if they display it correctly or not
vdd is core voltage
mvdd is memory voltage
An update to my wattage testing:
I was wrong, fan speed does not take a bite on the wattage.
I tested de Liquid Cooled one, and compared it stock and vega 56 flashed. Same power supply used, Corsair Bronze
ASUS STRIX:
Hashrate:190MH
Reported consumption: 140W
Real consumption: 200W
Gigabyte GOC
Hashrate: 166MH
Reported consumption: 165W
Real consumption: 185W
Gigabyte Vega 64LC:
Hashrate: 148MH
Reported consumption: 137W
Real consumption: 190W
Gigabyte Vega 56LC (flashed):
Hashrate: 190MH
Reported consumption: 146W
Real consumption: 212W
Note1: same OC as the asus, i will fine tune it later, i just want to test wattages
Note2: after the conversion to 56, same 64 OC settngs, same real wattage but 176mh
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I have a theory that the risers pull 20-30 watts for two reasons
1.
I have one server PSU that powers risers and GPUs.
On a different rig ATX powers all the risers and the server PSU just powers 4 cards. I monitor the wattage on those server PSU and when I move cards from the one with risers to the ones with out seemed like roughly 20-30 watt difference
2.
I never put 3 risers on a single sata, I do 2 risers per , but my buddy always runs 3 risers per sata and burns out a riser like once a month. (SATA power cables rated at 57w)
The fact that that your Gigabyte is off by 20w makes me think I am right
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Note that a bronze PSU will be about 10% higher wattage than plat PSU (85% efficiency vs 94%). So taking 10% off your numbers would help normalize to server PSU or typical miner PSU. Thanks for the numbers, LC much higher as I was suspecting. Gigabyte air seems to report fairly accurate actual power demand, accounting for efficiency loss. My rule of thumb has been 200W per vega and that seems to hold true here.
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Risers can pull 75W. Sata rated for 57W. So even one riser on a SATA is bad. They may pull 20-30W by default but if push comes to shove in demand theyll draw more. Risky using them period. Molex cables about $5 and enough evidence out there they can supply 75W minimum. Thats what i use for ATX one riser per cable. Server PSU non-issue of course. The gigabyte being off 20W is because of PSU efficiency loss. Card wants 100W, bronze PSU needs to draw 115W ish to actually supply 100 after loss.
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