Hi Zaajcew,
These setting drop my reported to 28MH/s as a lot of pre-sets seem to be using similar numbers to yours.
Try my numbers and let me know what you get. What kind of Average/Real-time are you getting?
Nas
dudes the important is that the reported is as much as possible, meaning your GPUs proccessing speed. average with gain on it and be equal or a little higher or lower , depends on the luck factor. so dont look at real time hashrate , look at your reported and average. about the 850 core voltage, it doesnt influence the hashrate. the core voltage keeps the gpu chip running. the idea is to get as lower core voltage as you can while keeping as higher core clock as you can. low core voltage = lower temp and watts consumed. higher core voltage means you can run the gpu with higher clocks but that increases also temp and watts used. so thats why while experimenting you get the sweet spot where you get the best temp and consumption for your MHs. you can easily increase core voltage and clock but at some point it just provides more heat and power usage than MHs.
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My reported with 850 and 900 was @ 61.63 +/- 0.01 but saw only maximum real-time peak of 70 with 850 and now seeing peak of 85+ with 900, Using -1004 for memory drops my reported to about 28/29.
I’m looking at the numbers from a Metrologist (Professional background) point of view because the reality is there is no such thing as 100% certainty. Main thing I’m looking at are the +/- of real-time because this is from the work that is done.
What I’m trying to say is on my current settings I’m fine with the extra 7w of usage because I’m seeing more higher real time peaks which in turn improves the average. I’ve seen a few threads where the real-time was much lower than the reported and after reading HIVEOS FAQ I’m understanding it as the closer the average (Based on Real Time) is to your reported (Estimated) the better.
I built my rig last Saturday and tweaking and stopping and starting the miner I’m not giving it a chance to run a full cycle. I’d like to think If my average ends up higher than than reported it’s a good setup to I should just leave the ball keep rolling. 
Hey guy’s. For some reason my 480 keep crashing. On on NBMINER. I have tried several O.C setting no help. Any advice.will be appreciated
hey thank for your input. quick question can you help. my 480 keeps crashing it nbminer and none of my o.c setting seen to be working. any advise would be helpful
you should post the OC settings or change the miner.
You have Samsung memory, and zajcew has Hynix memory.
OC settings are totaly different according to the memory you have.
For Hynix : Mem -1004 and Core 930 or 1000
For Samsung : Mem between 1700 and 2500, you need to try what works the best for you, and Core 1000 or 1050.
Here is my setting with Samsung memory
With 2500 for mem, I go over 33Mhs, but I’ve got a lot invalid shares.
I use T-Rex miner.
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lower the memory its too high. you can try with 1100 core clock also but 80 power limit.
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Update:
More 1660 Supers added to my rig I did get an opportunity to get my hands on a RTX 3090 but I couldn’t justify ROI ( >£2K for 120MHs) 4 x 1660 Supers Cost me £1500 for >120MHs. TBH very impressed with the BTC 37 S37 Motherboard which has 8 GPU slots.
Circa 220Mhs @ > 500W
RX480 was running hot because the Thermal paste and Pads needed a service as it was pre-owned - (can’t complain for £250) Now running sweet between 60°C>70°C.
3 x Inno3d 1660 Super added and they preferred memory clock @ -1005 anything more or less I’d drop hash rates.
1 x MSI 1660 Super Gaming X added - This one was weird - Comes with Hynix Memory my other one that looks exactly the same aesthetically has Samsung Memory) , The other weird thing was if I used similar setting to MSI Super Gaming X (Samsung) I get the same Hash Rate but an Increase of 10W consumption and I could over clock the Memory to 2500 and get Hashrates of 35Mhs @<70°C/77W<85W. But when I use similar setting to the Nvidia (Inno3D) Supers Wattage drops to 68W<73W
I sacrificed maximum hash rate for the lowest achievable consumption <72W for 30MHs<32MHs per card.
Max possible across rig was 235MH/s @ 525W but wasn’t keen on running @ 70°C<80° (With Invalid/Stale Shares seen + Reboots - possibly due to the heat)
Stable and Happy at 220MHs @480W<490W / 49°C<65°C (Stale shares <1%/ No Invalids so far)
Need to let it run for at least a week now to get a better picture and before any more OC adjustment As I can squeeze a little more from the MSI 1660S (Samsung) with a slight increase in stale shares under still <2% and under 70W definitely my favourite card at the moment.
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Welcome on board Nas Hushan!
Long life to GPU mining 
It’s quite impressive to see how the MSI cards run significantly lower temps than the other ones!
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for the RX 480 , have you tried different settings ? like these:
1150 core clock, no DPM , VDD 850, memory controler voltage 800 , no memory state , 2050 mem clock or higher. aggressive undervolting on.
Thanks Eon,
I did decommission the fans and heat sinks on all of my cards to check thermal paste as the MSI Gaming X were pre-owned. They have much bigger (Overall Thickness) heat sinks and have thinner fins designed horizontally so when the fans are on they blow out via the vents.
The Nvidia heat sinks are smaller (Overall thickness) but have thicker fins directed vertically which doesn’t make any logical sense because if they were in a PC housing the blowers would be blowing the hot hair around inside instead of out.
In terms of flow of air volumetric and velocity The MSI have bigger fans and have smaller outlets so at 30% fan rate I could feel it on my hand. On the NVidia the fans are smaller and the outlet has bigger holes and I could just about feel something coming out.
Yes, I’m a bit of a weirdo 
but then again that’s why I’m employed to analyse measurement uncertainties for fluid flow so it’s a win win to be in a niche job. I hate to think what I’d be doing with a liquid cooled graphics card 
I’d be using my work devices to measure the flowrates analysing flow profile, measuring the temperatures on different points for thermal dissipation and cooling efficiency. My boss would probably pay me to conduct the tests and then push the sales guys to visit the manufacturers 
to improve their quality standards 
Long life to GPU mining - Lets Go Champ 
Hi RKULOV,
I’m sure I’ve answered this above. So to answer your question again here is the result:
With: 1150 core clock, no DPM , VDD 850, memory controler voltage 800 , no memory state , 2050 mem clock or higher. aggressive undervolting on.
My card goes to sleep ZzZ
That it why I’ve set VDD to 875 as I made increments of 5 from 800 all the way to 950 and the same can be said with Core clock, Memory clock, DPM, Memory controller, Memory state I was literally happy to blow it but found my sweet spot.
Do you mind if I ask why you were so adamant I need to try these again? was there any particular reason why you were expecting? how about you try my numbers and let me see what you get… I’m a numbers guy so i find things like this interesting. 
I’ve tried and tested your recommendation and hundreds of other variations and combination and found my current setup to be the best for “me” what works for you might not work for others as I’ve mentioned before I am 100% on this statement that subtle errors in manufacturing processes means you can NEVER reproduce the exact same copy of the one before or after on the production line. Even if they have a 6 Sigma Process.
Yes, I guess I’ll need to educate myself on replacing GPU heatsink and fans safely should I get my hands on pre-owned GPUs soon.
Fluid wise, you may want to check mineral oil submerged PCs 
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Surprisingly it is very very very EASY! Just make sure you have some thermal GPU/CPU paste. Clean with electronic wipes reapply and done Literally a 5 minute job once you do the first one. There is a you tube video somewhere someone has already done to see an example and most have the similar setups.
I am sorry i dont remember sujesting the settings before tno you. With you settings i think my card wont do it because is asrock 570 power hungry shit and i barely made it work with 95 wats power and 31.11 mhs. But i often see these settings used in other rx cards.
i also tested your settings just to see what happens but with core voltage 800.
i got 2 watts reduction and 0.8mhs lower. i get exactly the same mhs like you do but with 95 watts consumption due to my shitty build GPU.
i have tested 1175 and 1200 cores with 875 volts, and memory clock 2080 with mem controler voltage 800. it does 31.85 with 1175 and 31.88 with 1200 but watts are to the roof.
so now i get 31.77 with 1160 core cloc , 850 core voltage and 2080 mem with 800 mem controler voltage.
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Hey Rkulov,
I understand the frustration only because as I overlook the quality of the electronics manufacturing for my employer and have to carry out uncertainty budget. Unfortunately we always have to allow some +/- tolerance as a part of life nothing is 100%. I was getting frustrated that I bought 3 cards from the same supplier and 1 of them just consumes more energy than the rest regardless of the OC settings.
I had some time to fine tune last night and go through the numbers you suggested and found that I can only use 850 when Memory clock is not set, as soon as I set it the watch dog prompts GPU dead or something along those lines… However I did end up finding what does work and did some more fine tuning and reduced the wattage by another 10W, lost 1MHs and also helped to reduce the temps further.
With energy prices now up an uphill in the UK I went the extra mile and even changed suppliers to find the lowest price per kW with cheap night rates as I plan to Mine 24/7, with the lowest temps possible and the lowest wattage at a reasonable hash rate. My goal was to try and mine at >0.1 Ethereum per month so that by the Time POS kicks in I should have about 0.6. The Calculator estimates 0.1547 ETH per month so I’m happy with that because I worked out that the money I’ve spent on the rig it would take me 5 months to come out in the green. Now I just got to stop tinkering with it
Set your self a goal with some tolerances it’s help with the frustration. I’ve achieved what I wanted for now and I’ll be around on the forums to help if I can but as soon as ETH has crosses over to ETH POS I will move on to Raven / ECG / ETH Classic. Need to find out more about these three as I managed to setup for ECG:
I only did a test run but not sure about how or where to process the coins yet. So got some research to do for my next chapter of mining.
Happy Mining
Nicely done. Its strange that the core clock affects the memory. For my card it doesnt matter what the core clock is , the memory controller clock is alway running at 800 and i can go to 2090 without crashing.
Whats ECG by the way? Have you tested ergo also?