Topic: Claymore's ZCash/BTG AMD GPU Miner v12.6 (Windows/Linux) - page 107. (Read 3839201 times)

You can use the MSI afterburner to undervolt.

Hey guys, hey snakey!

I have a little issue with my 4 x rx480 GPUs. Under windows10 i am using CLM's 12.4. It was working fine till today. I just noticed that yesterday I had around 300s/h but right now I have only around 230s/h. No idea why, becouse nothing happened, no config change, neither reboot.

Have you ever had something similar? Any idea how to fix it?
Thank you forward and have a great day!
Zoltan

Can I undervolt without messing around with the polaris bios editor?

I am happy with the speed, just want to undervolt.

Thanks for the information, I will give it a go.

Here is what I do to get 28MHs+ on my MSI RX470 gaming X 4gb Hynix .  (Find out what type of chip you have in the GPU - You do different processes for each)

1) In ATIwinflash save your base bios:  Open atiwinflash and hit save.  Save the file. 

2) Strapping:  Open Polaris Bios Editor and on the timing (MHz) copy the 1500 data to the three settings larger than 1500. On Samsung you will copy the 1750 timing to the larger values.  Watch this video that shows you how to strap.  I did the same method:  https://youtu.be/OP_zSP2H6ho  This will get you 23.5mhs per gpu.

2) On the MSI Afterburner I set the Memory Clock to 2000 and the Core Clock to 1150(up to about 1275) and press the check(Apply).  This should get you the 28mhs.

3) Now I go to WattTool and look at the numbers for each gpu individually.  In this case for gpu "0:Radeon (TM) RX 470 Graphics" look at the mV number in "R7" = 1150mV.  I do not want this number less than 1000mV.  This is just my preference.  Look at the Voltage Offset.  Whatever number you put in here it will be multiplied x 6.25 so, 20 x 6.25 = 125.  1150 - 125 = 1025mV(which is above 1000)  so this one would be -20 and then click "Set"  This gpu should now produce much lower watts.

4) Go to the next gpu and evaluate the number and make the changes in the Voltage Offset based upon the mV number in "R7."  Each gpu will be different.

Good Luck

Let me know if you have more questions.  

Talking about PSUs . Lets take 1Kwatt PSU with 80 plus gold efficiency.

Does that mean it can output 1kwatt maximum load to peripherals ?  I think sertainly its not good to run it on maximum load, but, in that case I will see something like 1200watt on my kill-a-watt meter at he wall,right ?

And also if I see 1kwatt on my kill-a-watt meter at the wall, that mean that PSU actual load is 1000*0.8=800 watt , and PSU is working in best load condition ?

@pacers101

Think also about the efficiency of your PSU cause it wont deliver 600W which depends on its standard (platinum/gold/silver or even lower) or lets say it consumes wattage by itself and this is sometimes not less.

AND another point... it reaches its highest efficiency on ~50% workload.

You need to play with
cclock
mclock
cvddc
mvddc

I would tell u exact numbers but i don't have 470's to help u out

Anybody tried the Biostar TB250 mobo?

I was thinking of trying it out but thought maybe you guys already had and have any advise

Thanks...

If anyone can give some information on how to undervolt I would be very grateful.

Saphire rx470 8gb cards.

You really should look at it. I have near the same config. 1000w psu , but celeron with 65w TDP , only SSD and undervolted 6*470s , without undervolting Iv got 1020 watt power draw from the wall. Not good. -100 mv undervolt, 1100 core clock and vualla , 850 watt from the wall. And card has stripted bios. I have 170 H/s ETH or 1800 sols/s Zcash.

VRMs heating up and losing efficiency (video cards or power supply). Say the rest of the system uses 80w actual (seems like a high number); that's 600-80=520w for 3 cards, or 173w per card. Assuming 80% efficiency, 173x0.8=139w/card.

You should see a nice drop with some undervolting.

I have a 1000w psu 6 x 470 8gb, was running fine before with older claymore version but now I have to unplug 1 card for it to stay on...I think its the watts, 140watts x 6 = 840 + 200w for the rest of the parts....

Don't know how to under vault, have not really looked into it.

I think you have to factor in the time it takes to get to thermal equilibrium. Based on how you are managing your fans, it may take a while for them to get to some steady state rpm.

Your system without cards draw up to 180-200watt with this CPU, add 140 watt per card, total 180+420 , its 600. All is correct. You can undervolt cards to get 110-120 watt power draw per card.
My rig 6*470s runs at 850watts

Electricity cost for me is expensive, most cards are over 200w but the 470 are around 150 from what most have posted here.

Anyone know the speed of the GTX 1080 cards? Vega cards are meant to be competing with that card but most are saying the vega should get 30 - 50% better speeds.

I guess if the speeds are not going to double the current cards then I might as well stick with the 470s since they are the lowest watt cards I can get.

I expect the Vega cards to be significantly higher priced, much as the Fury and Nano cards were higher. Probably close to double the cost of a 5xx card. From what I can see, the smart money is on waiting until the 5xx cards are released, which will reduced the price of 4xx cards..........but the performance difference in mining will likely mean the 4xx overall ROI and earnings will make them the best choice. It all comes down to price per hash.

on the ROI front just go with the fury. The Vega will be be in the 500/600 range and probably not much faster then the fury, although using less power. With the fury at $249 will take several years before the $350 in energy savings kicks in. The low energy Nano is still at $576. Maybe it will drop big as the vega release date approaches.

Ok thats where I was confused....580 8g will be similar to the current cards but the vega cards are the ones to watch out for..

To be honest I was actually talking about the vega cards, I was wondering if I should wait on those cards.

If your saying the vega cards need time for the mining software to be developed then it might be worth grabbing a few 470s before they go out of stock.

The rx5xx cards will not have double the speed. They are a rebranding of the rx4xx cards with trivial improvements using the same Polaris chips. The cards that are likely to have large speed improvements are the Vega cards, which is a totally different chip/architecture. BUT the Vega cards are unlikely to even be usable for mining for days/weeks since mining software will have to be developed for them. 

rumors claim the 580 8g reference card will be $199. Just wait a couple of weeks, The 480's will certain drop to the mid $100's. They are already all on sale at newegg