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I added some more 470s when they where on sale here.
One of the cards perform a bit bad compared to all my other 470s of the same model. It is one of six cards that not perform like all the others, i guess it is just a bad sample.

I had really big problems getting my 480s to work flawless with the H81 boards but it seem like it is working better with the 470 cards somehow.

Setup:
OS: Windows 10 Professional
Custom Alu frame
Asrock H81 BTC Pro
Celeron G1820
4Gb ram (16Gb virtual memory set)
Silverstone Strider 1200w PSU
USB Wifi stick
HDMI Dummy Plug
64Gb ssd
Powered USB risers (one riser per powerline)
4 x Sapphire RX 470 4GB Reference (Custom bios, mem oc to 1960Mhz)
Driver: 16.8.2

Miner: Claymore's Dual Ethereum+Decred_Siacoin AMD GPU Miner v5.0 Beta
Bios: http://www.megafileupload.com/k2gu/470_4gb_sapphire_modded_bios.rom

http://i64.tinypic.com/29ykz81.jpg
http://i66.tinypic.com/2hnmdeu.jpg

Real powerdraw not checked yet due to power meter tied up in my storage, probably around 150w per card. This rig is not optimized for low powerdraw just speed and stability.

Not a bad build considering the price of those cards. why are you OCing the memory so much?

To push the cards above 27Mhs, on stock clocks they perform around 25Mhs
I can push them even more to get around 28Mhs (close to 2000Mhz) but i dont want to push them too hard.

ROI calculation at this diff/price:
https://whattomine.com/coins/151-eth-ethash?utf8=%E2%9C%93&hr=108.0&br=5.0&d=71959302945528.6&p=650.0&fee=1.0&er=0.02119111&cost=0.1&hcost=788&btc=603.5&commit=Calculate

All my hw except gpu:s are recycled and ROI:d long ago.

Noob error... The difficulty on this website is far from being acurate. Check on Dwarfpool (http://dwarfpool.com/eth) the "Frontier Diff". That is the actual difficulty.

PS : I'm not saying this to you, but to prevent some people to think they'll mine much more than what they'll get :/...

Noob error you say.. lol.. I have mined for like 5-6 years.
I wrote "at this diff/price"

I did not saw it, but in any case, even now I don't understand. You meant at this difficulty or at this price ?

I meant the combination of diff/price at this time. The ROI calc is done based on that.
For me it is pretty irrelevant though because i wont sell one single ETH in the coming six months atleast.
I just wanted people to get a clue about what the rig is producing.

Im curious about the whole system power draw :)

as per the builds and the cards used the total power used is probably  somewhere between 850-900W i guess

I will meassure it tomorrow

I guessing at around 750 but will meassure it tomorrow

No need to push them that hard, you would generate a lot of heat, wear out the fans soon and maybe even burn your risers seeing how much power Polaris pulls through the PCIe slot.
Just copy the 1375 memory strap timings to all subsequent straps and voila, dual mining ETH/SIA 27.35/246 Mh/s at low low clocks of Core 1050/870 and Mem 1870/870 while drawing under 120W at the wall.
https://15254b2dcaab7f5478ab-24461f391e20b7336331d5789078af53.ssl.cf1.rackcdn.com/ethereum.vanillaforums.com/editor/bs/25jnfpsq79j9.jpg

Do you run the 4Gb reference card ?

Nice speed for that cards.

What settings did you applied? 1500Mhz memory strap? Which clocks & volts?

Yup, the RX 470 OC reference silver colored card with backplate.

Same as me.
I checked the rom i use in Polaris bios editor today.
All that is done with it is using the 1500 strap so i guess it is no point of redoing that.
What clocks do you run your memory at ?
I need to go atleast 1950Mhz to get over 27Mhs

to use that bios you have to change that AMD Driver right? What Crimson Version are you using?

You have two options.
1. Manually disable signature check, there is alot of guides for that around.

2. Use one of the latest drivers that dont use signature check. Not sure about the performance with those drivers though.

I use the 16.8.2 driver

check here what i get from this nice ref card ))
https://bitcointalk.org/index.php?topic=1584617.msg16361188#msg16361188

Thats pretty crazy.
My cards cant handle 2000Mhz stable, 2050Mhz is nuts :)

@Cryptozillah

can you post the Polaris Bios Settings including the Memory Strips?
Would like to test that on my XFX 470 Card.
What is the Reported Asic Quality of your Saphire Cards?

This is what is changed in the bios:

Original Sapphire RX 470 4GB Reference:
http://i65.tinypic.com/2rhpuhh.jpg

Changes:
http://i67.tinypic.com/dg2h6e.jpg
The 1500strap is copied to the 1625, 1750 and the 2000 strap. Nothing else.
When flashed on the card i overclock the memory to 1950Mhz to get stable 27.5Mhs on the 16.8.2 driver (need disabled signature check in windows)

I have not checked the asic quality

Powerdraw from the wall is 145w per card.

1950Mhz
http://i68.tinypic.com/zjgjyw.jpg
My only bad sample keep being a bit slower then the rest.

145w per gpu

Interesting than GPU2 seems to consistently hash lower than the other cards. Difference in ASIC quality despite being the same card?

That card is a bad sample, i have moved it around in the rigs but it is always slower :)
I have not checked the asic quality on any of the cards

you can check that easy in GPU-z, would be nice, so that we can compare it :)

For those results I had used the 1375 straps. The cards have been stable for almost a week of 24/7 operation. But recently i checked with HWinfo and saw that half the cards were getting a lot of memory errors (almost all of them minor errors, so didnt result in invalid shares).
While these memory erroes may decrease the cards life in the long term ( from like 5 years to 2 years, which is basically inconsequential with POS ) they were not impacting claymore reported hashrates. Hashrates at the pool were consistently 10% lower so that made me curious. To test this thoroughly I tried gaming on these cards with the 1375 strap and while game benches did not crash, I could see fram drops everywhere and stuttering telling me that the memory was struggling to keep up, and having to possibly rework, which could explain my consistently 10% lower pool hashrate.

I then decided to go back to the 1500 straps and they have been rock solid at ETH 26.8/ SIA 241 dual mining with the same clocks 1050/870 1870/870 and I am going to be sticking to these settings.
For a few cards you can perhaps check if the 1375 strap is stable for you and check in HWinfo for memory errors. If your cards pass, that memory strap will yield godlike performance/watt. But since I run about 30 cards, its hard to track and manage which cards run at what strap and settings etc so I just go with the minimum stable settings across the board.

How do you check the HWinfo?

Asic quality on all cards in this rig:
75.3, 73.9, 89.1, 71.5
I did not have time to check the order of the cards, all checked while they where mining.

That is very high ASIC quality. For my R9 390, they are from 62 to 78, but mainly in the lower 60 range.

Ok, these are the cheapest Sapphire 470 4GB model around, they cost around 190 bucks here.
One thing is good to know with these cards that i have. The backplate make the cards to fat to fit side by side mounted directly on a motherboard.

http://www.sapphiretech.com/productdetial.asp?pid=0582294D-5A90-4EF0-B5E1-5EDC1C3ACBE1&lang=eng

I rebuilt some rigs here and added two more gpus from another setup.
I also optimized it a bit, i could tweak it more but i dont have time to do individually tweaking right now.

http://i68.tinypic.com/359dbpu.jpg
http://i65.tinypic.com/j74u20.jpg

Powerdraw from the wall: 890w
Mem running at 1980Mhz, could probably go up to 2000Mhz but will let it run like this for a while.

How did you get all 6 to work in Windows?

Ive also a 6 x GPU 470RX 8 GB Rig... running very smooth under Windows 10 and get about ~163 mh/s @ 809 Watt  ;D


https://i.imgur.com/pW7OevE.jpg
https://i.imgur.com/Y9jJhYB.jpg

Windows 10 support eight gpus without any hacks

Sweet, nice work :)
I could drop some more if i give it some more love. I will look at it when i get some spare time.

Yeah the problem you know also is the time...
Had try many other settings but after a time about 24 or 48 hours they get a error or reset the running minning.
After Powerdown the GPU's with WattTools after the dag file is generated they wont restart with that setting...  >:(

Yeah i have noticed that and it suck.
I have my miners on autostart if the system hangs and reboot but if that happend now it will hang at DAG creation.

I know that there is a function in Claymores 7.2 version that is called lidag. It set low intensity during the DAG creation.
Have you tried it ? I messed around with it really quick but did not get it to work. The 7.2 miner work really bad overall for my RX rigs from what i have tested.
I use 7.1 right now and it is solid.

I also use Version 7.1 so i get the best preformance with it, and no i dont have try the lidag because this version is so stable :)
Maybe there is a way to Autoset WattTool like this ??

Reboot, Set GPU normal (+4), Start Mining, Wait 5 Minutes set all selected card to -13.
Sometimes WattMan get a Error and Replace Card Backup but i dont now any way to setup the -power auto  :-[

ATM Rig is running 71Hours without any Error i hope ill get it this time :D

I dont know if ther is any way to delay wattool, lidag should probably be great if it worked in 7.1. The high intensity versus low powered gpus at DAG creation makes the rig hang after reboot.
It seem the way to go right now is to get it as stable as possible and just keep watching it if using 7.1

Regarding wattman, i have noticed that on all my rigs that use risers will lose the oc settings after a hard reboot (killing it with powerbutton). This dont happend on my rigs with gpus onboard the motherboard after a hard reboot.

My 470 rig is working really good with powertuning while my 480 rigs suck bigtime with powertuning. Right now i removed all tuning on my 480s because i dont have time to do it properly. Uptime is more importnant then saving some bucks right now for me. The feeling when you wake up and see rigs have been idling for 5-6 hours aint that sexy :D Without powertuning all 480s run like a train without derailing @ 30.5Mhs

My 470 rig ran for around 24 hours before first crash, lowered the tuning a bit now and will see what happends.
One REALLy strange thing is that one of my 470s always have been 2-3Mhs lower then all my other cards. But after setting like -15 powertune on it the card jumps up to the same speed as my other cards. Identical brand and same rom on all cards, i guess it just work better with less power.

There many difference between the GPU's and i dont mean only the Name or the Number...
On playing with this Cards there is no diff but on mining you can see that no card is equal with a other.

The ascis quality on the ram is important, so also the speed from the card is other. Just check the Cards with WattTools and you will see that every single card have other values.
To get the best preformance you must change step by step for every card in single. So one Card Works great with -17 one with -15 and a other one only can make -13 Power..

Its easy to find a middleway and send it to all cards but the best way is make it for every card single...

This is also a good Place to get some Infos and Tuning Tips :
https://forum.ethereum.org/discussion/8845/rx-470-mining/