Bitcoin Forum

Hello all,

I have got a rig of six Sapphire Nitro+ RX570 8GB. I have modified and flashed them with one and single bios. Now every single GPU is hashing at the rate of 28.8+ and power consumption bellow 110 watts and temperature not reaching 60^c. Process clock: 1125, memory clock: 2000. Two gpu's not giving a single memory error and the other four is throwing errors but still keeping hash rates stable.

How is this possible that one and the same bios is working differently on 6 and the same type of GPU's. How to resolve memory errors? Should i try to overclock problematic cards at the lower levels?

Any suggestions?

Would like to know as well. I've got a card that's throwing mem errors like crazy but hashrate is just fine.

- there is a chance you vga cards have a different bios :)
from the same manufacturer , same model number , vga cards can have different bios version numbers ...Rom files are not interchangeable .
if you flahsed a wrong bios version number to your cards , its can give you a lot of mem errors , decreased hashrate , hashrate going up and down , you mining rig become instable , random reboots , blue screen ...

- or you have a cards with a very different ASIC quality , so every cards need to be fine tuned one by one , if you want to get out the max from them :) Higher ASIC quality cards have more overclocking potential ..

Although the videocard of the same manufacturer and uses the same memory, the memory chips are still different. Some more successful, others less.
Memory frequencies for each card individually and then install them in the rig.
Although the frequency of 2000 MHz is small...

I'm trying to reach your results on same cards - and having hard time getting beyond 25 mh/s (Anorak mod OR Polaris OneClickPatch BIOS Mod)
Which BIOS mod did you use?
I want to try and see if I get same errors with same speed

Well, I have tried these mods as well, but no luck there so after researching I have decided to go ahead and mod it myself. Here are few links that might help you.

https://steemit.com/mining/@myethereum/how-to-set-memory-timings-straps-powersave-and-overcloking-for-mining-etherreum-working-with-rx470-rx570-up-to-29-mhs-and-90w (https://steemit.com/mining/@myethereum/how-to-set-memory-timings-straps-powersave-and-overcloking-for-mining-etherreum-working-with-rx470-rx570-up-to-29-mhs-and-90w)
https://www.techpowerup.com/forums/threads/amd-ati-flashing-guide.212849/ (https://www.techpowerup.com/forums/threads/amd-ati-flashing-guide.212849/)
http://hardware4mining.com/ (http://hardware4mining.com/)

Thanks for the article. Really helped to boost to 28.3 Mh/s in single mode (at 74 degrees C, 95 watt)
Not getting any hash errors.

I wonder if you have sufficient power/volttage on the cards.
Do you think that you have sufficient PSU?

I remember similar issues with DDRAM (depending on sequence, placement) - I was "losing" RAM till I found that stronger PSU solved it

NB: going to install more GPU, will report back with my findings (so far running just one)

Cheers

Did you flash your cards? My power meter currently shows the whole rig is using below 950w of power so I would assume it should be enough. My cards throw memory errors at random. Sometimes when i reboot my system gpu0 is showing stable 0 next time same card is throwing many errors, very strange. What motherboard do you use and how many rams you got installed?

Hi,  I hope you dont mind me asking but I too am setting up a rig with 6 Sapphire Nitro+ RX570 8GB cards.  I have a  Seasonic Prime SSR-1200GD 1200 W 80 Plus Gold Modular Active PFC Power Supply Unit.  Can you share what Risers you have installed (do you have a link?)??

Many thanks for your time

T-Module Updated PCI-E Express 1x to 16x Powered Riser Cables 0.6m USB3.0 SATA to Molex 6 Pin Kit Pack of 6, GPU Adapter Card Extender Cable Building https://www.amazon.com/dp/B071ZF96W8?ref=yo_pop_ma_swf

Hi really appreciate your reply!

Are these the equivalent in the UK https://www.amazon.co.uk/T-Module-Extender-Building-Ethereum-Extension/dp/B071ZF96W8 (https://www.amazon.co.uk/T-Module-Extender-Building-Ethereum-Extension/dp/B071ZF96W8) ??

Just want to make sure  ;)

Pretty much any risers will do the job. Just dont take the cheapest ones as they can fail and burn your gpu.

Thanks! Really appreciate your time.  How is your Rig running BTW?

I got two rigs now running both identically the same apart from one rig gpus are flashed and the other are just boosted with MSI afterburner. I noticed that PSU of 1000 watts is to small and them cards require at least another 200 watts on the top.

The rig with cards that are not flashed lacking only about 25 mh/s. I have not yet checked the actual power usage with a device on this rig but the first rig with flashed gpus continuously draws about 1100 watts.

Guys, do you think setting up rig 1x Mobo 12x GPUs - is easy enough to set up?
(in theory - it is the same as 1x Mobo and 2x GPUs - but a little more work with the wires and flashing them)

What's your opinion on this? Any caveates?

It depends on how skilled are you. Windows support only up to 8 cards if I'm not wrong. So if you wanna go higher you need to move onto Linux.

Skills - should be alright - occasionally assembled PCs and Servers from scratch (as a hobby and as my job). Never used Linux though

Thanks for the tip about GPU limitation.
Found an article that since november x12 GPU (AMD) should work fine http://www.aurelp.com/tag/how-many-gpus-does-windows-10-support/

Dont think it would be very difficult to set up a linux rig since you got some experience with computers and on top of that there are many tutorials how to do it. Where are you based, UK by any chance?

I am :))

Want to move to this electricity provider - https://join.bulb.co.uk/join/quote
Much cheaper (but with this ETH price - it doesn't matter much)

12.4p kw/h looks good. I'm currently with SSE, 13.5p I think and a standing charge on the top which is similar to Bulb. I would like to make a weird bet, I think you are not english, since igrok in russian means player, is that true?

hehe I do speak russian :))
And I think you do too :))

Looking for good prices for GPUs - it looks that prices got much higher :(

Yes, they have increased significantly since the December. The last time I bought them I got for £250 each of RX570 8GB now I cant find a deal close to this price.

Hi man try to give more power to your cards. In claymore i put 890 in cvddc mvddc and i couldn't even mine. Now i set 950 to each cards and i get a stable 28.8 at  cclock 1320 and mclock 2100.

Anything above ~1175 on core is a waste for ether mining, your hashrates will most likely be the same at 1175 vs 1320 but your powerusage will be 30-40% lower.