New Update
Details rom usage.
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Ethereum tests:

134 Mh/s @ 2.25A, 495watt (6 Cards) stock settings rom

185 Mh/s @ 4.8A, 1050 watt (6 Cards) 1020 Core, 300 Mem


Details package
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-175mV(memory) rom
-200mV(memory) rom (only for the silicon lottery winners!)
Atiflash (command line flash tool)
AtiWinFlash (Gui version)
Readme.txt


Details ROM
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Core voltage is set at -100mV
You can go lower with software like afterburner.
Do this in steps. F.e. +6mV, if stable, try +12mV.. and so on..

I noticed that -100mV is the most stable for all cards (i have 100 so i know..)
Some will even do -125mV without issues.


Memory Voltage is set at -200mV
This will work just fine with this rom when mining Ethereum or any other low memory usage algo.

Core clock is set at 800 stock but can easily be raised to 1000 or higher.
Memory Clock is set at 300 stock, this can also be raised but i would advice not to. IT has not point anyway....


AtiFlash.exe
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I use this one because i just like it and has never given me any issues.
It is NOT possible to use a version of atiflash when your system is loaded with a bootable drive (ex. Win 98 USBboot)

Steps:
1. Unpack everything to a folder of your choice.
2. Run cmd as administrator, go to where your folder is located.
3. To flash enter atiflash -p -f 0 DPM-200mV.rom, wait until atiflash tells you to restart.

!!!: Do NOT have HWiNFO , GPU-Z, MSI AB, etc running in the background when flashing card!

AtiWinflash.exe
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Run as Administrator.
Easy does it...


Issues?
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I would advice everyone, after you flash your card(s) to remove your driver with DDU
and reinstall your driver. This always works! It takes some more time but it's worth it.

You can however just restart (don't just restart, completely shut down your system) "Power off!",
go to crimson preferences and reset everything.

Remove any profiles you have in afterburner (Program Files(x86) - MSI Afterburner - Profiles)
Remove settings from Trixx
Idem for any other OC tools.

You can always contact me with questions!

Greetings

Heliox.

I've got a few pm's with people asking me for a donation address.
Well. okay than.. :p

BTC: 1HELioxkK8iXWhvryQU7gJtBFgWhne86Tr


Link: Here



Some old info and blabla:

Hey,

As we all know, the R9 Nano is one of the most energy efficient GPU's out there at this moment.

In the past months i've done numerous of tests on how to get this card as stable and as power efficient as possible.

I've been thinking about sharing my results and tests and came to the conclusion to keep it short and as helpful as possible for every Nano owner out there.


To make a long story short.

I modded my Sapphire Nano rom (with some help from someone) to the point that it almost dropped 50% in power usage at the same speed  

For example:
My nano rig (6 x Nano) would do around 170Mh/s "give or take" on Ethereum (stock settings) while pulling 6.8Amps from the wall!
So that's around 1500watt.

I could pull that down to around 5A with -100mV on the core clock, also stock clocks! Not bad at all! (Afterburner). "1100watt"

So with only doing that i would win 400 watt and some serious temperature changes.

Well, that wasn't enough for me :p

So i started messing around with the bios "rom".

I managed to modify the bios to set the stock vddc to -100mV (Afterburner's maximum negative offset is -100mV).
I also managed to modify the MVDDC, "Memory Voltage", also to -100mV (can't even do that in afterburner :p).

Ran another test with settings in afterburner at stock, didn't change a thing. And guess what?

Yeah, power went down to 4.85A "1055watt" another 45watt win. (not much but it's something!)

Now here comes the good part.

Because the card is now at stock -100mV, that means i can pull it even lower with Afterburner.

So yeah, obviously i did that. I managed to squeeze another -18mV out of it without going crazy :p (lower would result in driver failure).

Yup, another win in power! 4.7ishA! "1035" watt. Still at stock clocks and same speed!


Then the best part.

Obviously i wanted to find the best power/hash ratio.

Conclusion. 800 Core clock, my modded rom, -18mV in afterburner and 300 Memclock.

2.4A "530watt", 6 cards, 140Mh/s Ethereum.

Voila :-)


I'm sharing my rom but would want to warn other Nano users. My Nano's are Sapphire's. I'm not sure how this rom will react on a nano from another Company.

So please be careful. (you have a secondary bios switch, so you can always switch back)


For all the *nix users out there. This might be very interesting for you guys because i know what a hassle it is to change voltage in linux. Yeah.. not...

Also, if you want to flash in Linux, that isn't possible right now. You'll need Windows. (And not a bootable version! Won't work on Fiji..)


Ps. Cards/configs may still be submitted to mininghwcomparison.com!  

Enjoy!

Great answer......  

Win 10 is rock solid over here, fastest os regarding mining i ever used. No shit with installing gpu drivers when having more than 5 GPU's. It just works.

Try 3.0 Marvell1,

Works perfectly over here, had some small issues with 3.2 as well.

Also add -ethi 4 to your bash, could solve your problems too..

You should increase the dcr intensity, especially for nano. It is easy - just press + or - in the mining window to find Your sweet spot
You can also set the -dcri parameter in the bat file.

What is the model of the XFX card? Are they the 1015 MHz ones?

Marvell1,

Well, i had a feeling that it wasn't going to work.

With those nano's, it's different, they're all reference designs, so my rom will work on any nano. I'm pretty sure of that.

I didn't know what kind of 390 you have so i just took one of mine.

Could you send me your rom, i'll mod that one and that will definitely work then

Greetings!

** edit flashing from dos seems to be working now**

tried to load your bios to my MSI 390 using AtiWinFlash and I get a SYSTEM mistmatch error never seen that before on flashing

i made a backup of the bios from another MSI 390 and flashed it to the card that would not work with your 100 100 bios and it works any ideas ?

Sure.

Try this one first.

-100mV both Core and Mem

Link

If it's stable, i'll lower it some more


Greetings

Sure.

Try this one first.

-100mV both Core and Mem

Link

If it's stable, i'll lower it some more


Greetings

Hey Marvell1,

Thx for the nice words.

I went ahead and did a small mod on one of my 390's (NON X) rom.

There are 2 roms in this pack.
one with -100mV on the memory voltage
and one with -150mV.

Core voltage is still stock (you can change this with trixx or afterburner.)
Core clock = 1040
Mem clock = 1500

Link

Make sure to use your backup rom position.

Good luck and have fun!

Hey Marvell1,

The rom i shared has a mod on the core voltage (-100mV) and a mod on the mem voltage (also -100mV)

You can open afterburner and go even lower.

So if you set (-12) you will have -112mV

You are correct, you cannot reduce the memory voltage with afterburner or any other software.

This has to be done with a hardmod.

The Rom i shared can easily hit 150Mh because you can still set 1000 as core clock (it is stock set at 1000).
Thus giving you full power but with less energy usage.

I will share my second rom as well. I will edit the op.

This one is even more energy efficient.
Although it is set at stock 800Mh Core clock. (you can up this to 1000 in afterburner if needed).

Greetings.

Had a dead Nano a few weeks ago, was flashed with my modified rom.
I switched the switch back to the original position.

Sent it out, received a new one without questions.


Further, Ridiculous expensive? Depends on what you call expensive.

I bought in bulk, got a very nice price (same as a 390x).
So if i ever resell, i could even make a profit out of that as well

 

Ps. I am Eliovp (this is my account i use at work..)

man u r very active...
u deserve every penny .....
thks again

How do you know the Claymore miner is submitting shares slower than the ethminer? Will this be solved by 3.1?

I found a way to lower memory clocks with MSI Afterburner, even when this feature is disabled in AMD driver, so, we need:

1. Run MSI Afterburner and check that "Unofficial Overclocking Mode" is currently DISABLED

2. Set desired memory clock setting (for each card if they're different in your rig) and hit apply, save these settings at the first profile and check "apply overclocking at system startup" box. Now, if you run GPU-Z, you'll see lowered clocks at the "Graphics Card" tab, but if you check "Sensors" tab, you'll see that memory clocks remain the same, nothing has been lowered actually.

3. OK, go back to MSI Afterburner, go to Settings and ENABLE "Unofficial Overclocking Mode" without PowerPlay feature and hit OK. Now your system should restart automatically.

4. When everything booted up, you should accept terms and agreement in the popup window, and then you can check with GPU-Z, your memory clocks are really lowered now to the numbers you've entered with Afterburner earlier and will not raise to factory settings until you want it.

5. ATTENTION! After these manipulations you won't be able to do any over/downclocking with MSI Afterburner actually, if you want so, you'll need to disable Unofficial Overclocking Mode and restart your system, but in this case memory downclocking will be lost.

Worked on each of my rigs (have 12 of them), each of them have the same card models onboard (but different manufacturers), especially tried on 290x and 390x.

Gald if this will help somebody.

Nvidia - no. Failover - yes, in next release.