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I am creating a thread as we need to get some momentum going on RX 480 BIOS mods.

So far we do know that there is a way to unlock RX 480  4gb cards and turn them into 8gb cards.

However, now we need solutions to undervolt and overclock GPU + increase fan speed.


So, anyone have any success on bios mods or  Ubuntu 14.04 or 16.04?  

Yep...running custom BIOS on ubuntu 16.04..29MH @ 120 watts.

Let me step in here.

There is no way to pass signature check 'yet' .. So a "custom" bios <-- Not possible (yet)
Reference: Here (http://www.overclock.net/t/1604979/a-temporary-fix-for-the-excess-pci-e-slot-power-draw-for-the-reference-rx-480-cards)

Trust me, i've tried.. several times, thought i'd cracked it but no.. it's not yet possible.

The only thing that is possible is to modify the amd drivers to be able to go higher than 2250 mem.

Which i have done and which i have proof of.

Here: http://i67.tinypic.com/jae4k1.png


I would love to see some proof of that 29+ Mh..

Greetings

never said anything about running crap windows  ::)

Interesting..

What clocks have you set?

I assume you expanded the last strap to be able to run in a higher timing than 2000?

14.04?

Greetings!

Edit: just saw your post in the other thread.

Guess i need to test on linux ;-), thx!

Yeah in linux you can run any type of bios, while in windows if you try to run those modified bios's it will just crash on startup.


jstefanop, how much in total from wall ?

Yeah i know, signature check :/

I get 81 and 85 watts on gpu = 166 watts   for 2 rx 480s  and hash at 24.3 for each.

but that  gpu-z  translates to about 250 at the wall

well 300 at the wall  and take off 50 for the pc. 

so if my 166 watts is  250 at the wall

an 83 watt gpu-z  = 125 watts at the wall  for 24.4

he is 101 watt gpu-z  add 42 watts  he is just about 143 watts at the wall  for 29.4

125/24.4 =  5.12 watts per mh     me

142/29.4 - 4.86  watts per mh       jstefanop

keep in mind  I am guesstimating his at the wall number.

but i think he is doing just under 5 watts per mh  while I am  just over 5 watts per mh

120 watts at the wall for one card...180 total system power.

@jstefanop
Do you mind sharing your settings?
 ;D

I've created a custom bios for the rx 480 and successfully flashed it onto a ubuntu test machine.  Will be testing it for the next day or so.

My goal will to lower temps and power draw ~20% or more.

VERY interested in your results.  Best of luck!

Flashing BIOS over and over can be time consuming.
I've successfully reduced power draw by 20-25 watts at the wall outlet.
Stock Total System power draw was 205 watts/hr @ the wall with 1 - RX 480 card in.
Total System power draw is now 180-185 watt/hr @ the wall

Mining 22.5 to 23 mh/s on a 4gb Sapphire rx 480 in Ubuntu version 16.04 LTS.
In Windows the card would probably run 24 to 25mh/s.


I believe there is a bit more room to go.  Gonna test a bit more then probably take a break as its nice outside :P

Ok I hit 155 watt at the wall @ 22.5 mh/s...more testing is necessary.

4x RX 480 - Using Wattman - 2x Gigabyte Reference Cooler Design - 2x Sapphire Reference Cooler Design - DCRI 32
-Core MV = Default
-Power Limit = +2%
-Clock Mhz = +2.5%
-Memory Clock Mhz = 2000Mhz
-Fan Speed = 82%

ETH (Total Speed) 98 MHs
SC (Total Speed) 1560 MHs

Highest Temp observed, 75C
Watts Measured at Wall, 745W

Even with these settings for whatever reason my GPU's will not hit their max clocks

Below is a screen capture of my performance and configs.

http://i578.photobucket.com/albums/ss224/eyedolx/Crypto%20Stuff/Mining.jpg

http://i578.photobucket.com/albums/ss224/eyedolx/Crypto%20Stuff/Wattman_1.jpg

Getting some good results!

Hello,
how can i Undervolt the Rx 480 in linux? only with BIOS Flash? but there is no Dual-BIOS?
if i set the Value to low the Card is demage?

lg Martin

Ok so the lowest I got power draw to was ~110 watt per Video card at the wall but then it crashes after a while.

Anyone have better results and willing to share?  Preferably stable.

For Ubuntu 16.04 LTS

The card pulls 112Watt at the wall..maybe even less.

at 900 mhz gpu, 800 mvolt
1750mhz ram, 1000 mvolt


I was able to do 1200mhz gpu, 850 mvolt
1750mhz ram, 1000mvolt

It seems that the card becomes very power inefficient once it passes around 1100mhz-1200mhz gpu core.
I am going to test what I can undervolt the ram  to and lower core gpu mhz as well.

Hi greaterninja,
What tool are you using to alter the core and mem freq for the card?

my atiflash utility was not able to find the card to pull ROM from..

Device 0 not found

even though i am mining with it flawlessly..

would like to flash these bios to some higher clocks if someone could point me in the direction of some non windows utilities.

My rx480's speed: GPU1 27.042 Mh/s, GPU2 27.247 Mh/s
It's working on Claymore' DualMiner program....

MemClock:2200
Powlim+10

Who can make a bios mod?

What OS?

With new drivers for 8.1 memory clock is locked to 2050max.

Mine are @ 24.7 MH/s drawing 300w at the wall with bronze PSU. So~135W per card.

Win7 64bit

XFX RX480

How to reduce the memory frequency in UBUNTU?
The "PolarisBiosEditor" like there is no way to change the memory frequency.

When you guys post your reports here, could you also specify what model of RX 480 do you have? Most aftermarket cards have 8-pin, curious to know how it changed the power draw.

Thanks!

I will get six MSI RX 480 8GB cards delivered tomorrow.
My plan is to run them in one rig under Windows 10.

I am going to tweak the TDP a bit. What is the best tool for editing the vga bios these days ? RBE ?

I'm running 4gb RX 480  reference cards.

XFX and Sapphire.


GPU mhz-GPU Voltage-RAM mhz-RAM Voltage-FAN RPM

The Windows cards run 900mhz-800mv-1750mhz-1000mv-2800RPM.

I just started testing in Windows yesterday.


The linux cards run:


900mhz-800-2000mhz-850mhz


The problem I have with the cards is they get pretty hot  70-80+C.

What RPM or % are you guys running your reference cards at?

My 480 8GB reference cards @ stock clocks/volts are running crazy hot above 85 degrees. I have my fans going on auto, i will try to arrange some better cooling later today.
The fans run at 2180rpm as we speak.

Have someone Test a Bios Flash?

somethink like this?

http://overclocking.guide/download/amd-rx-480-mining-bios/#comment-22855

Anybody can help me to flash Sapphire RX 480 Nitro of 4GB  (Not nitro +) ????

Thanks
Almir

Yesterday like a junky I retried to OC my new 480 (Sapphire 8Go)... May turn toasted

It worked as first step, but consumed 20 more Watt per GPU, despite underclocking of GPU.

use atiflash (linux, windows, or dos) to save the orginial bis (never use someone else bios).
Use polaris bios editor (I used v1.4.1, and 1.4 , both worked) to edit a copy of the original bios :

1- I copied the memory strides in VRAM TIMING VALUE block
taking the hexadecimal stride of 1650, to all above (1750,2000)
2- I changed max GPU freq from 2000 to 1200 in POWERPLAY (some advise 1100)
3- I kept the line 2000MHz/1000mV in MEMORY block, but mayve you can change MHz fro 2000 to lower at beginning (maybe test at 1750)

then flash the bios of one of my card (easy on linux, I've scripted all).

Initially my card was running nice at 75% FAN, then after 2h claymore detected GPU hanging and kernel reported PCI communication problems...
I configured claymore to 85% fan, and target temperature at 70C, and it runned perfectly for a night.

maybe I did something wrong... I'm beginner.

I will try to undervolt a little (too much and your card is bricked - keep atiflash for dos or linux ready, configure your PC bios to activate internal video at start, in case).
Not sure it can work, as some say undervolting with PolarisBiosEditor is impossible... but some seems to do it... I have to confirm.
If someone know whether and how undervolting works.

If using Linux you need to run it as root or with sudo