Topic: [UPDATE] RX480 (Ref) 31+Mh, Custom Rom - VDDC OFFSET + Custom timing - page 19. (Read 231045 times)

Using an APC ups for power measurements, no wattmeter. GPUZ readings at ~70W per card, APC reading for whole system ~620W. Exact model : Sapphire RX 470 4GB OC (Ref design)


Bios Mod with 1500 mem strap all the way up
Core : 1050/870
Mem : 1870/870

Dcri -18 for Siacoin dual mining (22 is the most efficent profit wise but I wanted lower heat for my sata-molex risers).

~26.8 ETH / 240 SIA

Running for almost a month, hiccup free.

Exact model of cards? Watt-meter?

It seems pretty down low. How much do you undervolt?
I have some rx 470 4Gb and my power usage is almost 1.5 yours

No - it would not be


You will not get 900W from wall hashing with 6 RX 480 with rate of 180MHs

Single or dual mining?

Well im running several 5 X RX470 rigs at ~620W each, hashing at 133Mh/s+ and while I have no 6 slot motherboards to test, adding one card to this setup would push the Hash to 170Mh/s and the power to 750W. So I see no reason why 6 Rx480's cant run under 850W or even, possibly 800W.

No - it would not be


You will not get 900W from wall hashing with 6 RX 480 with rate of 180MHs

The reference BIOS will not work with the Nitro+. You need a modded Nitro+ BIOS, which I have, as I did my 6 cards.

But it's not great. For some reason the Nitro+ cards will ignore VDDC set below 1v, it essentially bottoms out at 1v and I have to use MSI AB or similar to get it to go lower. Nearly all the cards will run with VDDC of 0.89v at 1125MHz core speed. Sio much power saving to have, just not via the BIOS. Not sure if it's a card or driver issue preventing the BIOS setting VDDC lower than 1v. My reference card doesn't experience the same problem.

Also, I'm finding very few of my Nitro+ will do 2200MHz on the RAM like my reference card, so for safety and stability I have RAM set to 2125MHz, this still get's it over 29mh/s per card.

I'll look to share the BIOS later if I remember.

And I'm certain it would be possible with a titanium efficient PSU.

I can definitely see power draw from the wall at around 900w, and less.

Thank's for this very detailed guide.
Many seem to have successfully updatet they rigs.
I've tried for two days now with different drivers, changing slots etc.
Never get it running.
Whenever the modded card is plugged in, Win10 gets frozen or so.

Is it possible it does not work with Sapphire RX480 Nitro+ ?

These are my notes on flashing 6 x RX480 Sapphires.

It was a success!

Many thanks to Heliox, jmumich and others for your pointers.

No guarantee it will work for you but the checklist below will be useful to find all the files needed to get started.

OBJECTIVES
--------------
My rig is 6 x Sapphire 480 8Gb Reference cards. Win 10, ASrock H81 mobo, Celeron 1840, 8GB RAM, 120GB SSD and powered USB3 risers x 6. EVGA-G2-Gold-1300w.

My goal is to flash the cards with Heliox “low power” RX480 rom mod and save power consumption and bring the hash rate to as close to 30MHs per GPU. Previously its running at stock 22-23Mhs per card. Power draw just under 1100watts. I will do some power comparisons and fine tuning tomorrow when I get my hands on a kill-o-watt adapter.


DOWNLOADS
---------------
Before your begin, download some of the necessary files you need to do the flash.

Download the special “atikmdag.sys” from  "http://www.win-raid.com/t892f16-AMD-and-Nvidia-GOP-update-No-requests-DIY-19.html#msg30028”. You need to register yourself  on this site so that you can download the file.

Download the Low Power 480 ROM Mod from Heliox’s website. Download link here - http://www.mininghwcomparison.com480lowenergyok.zip/

Download the latest atiflash utility at https://www.techpowerup.com/downloads/2728/atiflash-2-74


FLASHING
-------------
Open cmd.exe with Admin rights and find the atiflash command line file. There is a windows version but I didn’t use this.

Type "atiflash -i” to list all the GPUs in your system

I will do the flashing for every card one card at a time, all in one go. So let’s flash the 1st card by using the commands below:

To flash first card, type "atiflash -p -f 0 480lowenergyOK.rom”

To flash the 2nd card, type "atiflash -p -f 1 480lowenergyOK.rom”  

Modify the "- f" switch accordingly depending how many cards you have

After you done flashing. Reboot PC.


SIGNING THE DEVICE THING & MINING
------------------------------------------------
After booting into windows… install the latest Crimson drivers. You can find the latest 16.7.3 driver package for 480 series in AMD website.

Next, goto Device Manager and find Display…. you GPUs should be listed there - for my case I can see all 6 cards but it has an error mark on it.

Right button click each of them and disable all GPUs.

Next reboot to safe mode by pressing Shift key and reboot.

Ensure that you select Safe Mode with Networking so that you can download 1 more utility to solve this device signing issue.

Before you download that file, you need to replace the atikmdag.sys file in c:\windows\system32\drivers folder with the special atikmdag.sys file you download earlier.

Download the device signing utility from  "http://www.ngohq.com/?page=dseo”. After downloading dseo file, Open it and sign the atikmdag.sys file in the windows folder.

Next, open a cmd.exe window with Admin rights and type “bcdedit.exe -set loadoptions  TESTSIGNING”

Reboot as per normal.

Goto Device manager and enable your GPUs again.

Reboot for good measure

You are ready to launch your miner - in my case is Claymore Dual Miner…. I am doing only ETH btw. You should see 29MHs per card.

thanks for the pointers Eliovp and jmumich -- will put this in the checklist.

Btw, Eliovp, your rom zip links seems bad, is there a folder in yoru website to download ROM files?

Show your hwinfo64 screen (gpu mem error rate) before claiming the win ))

win  

480 4GB Elpida -29mhs