How do I change GPU Memory voltage to static?

I’m using Polaris Bios Editor to undervoltage to 860mV both of GPU and Memory like this.

Then I ATIFlash 2.74. but I can not change Memory everytime. Why?

Modding the ROM the way you are will potentially make for a very unstable GPU.

Secondly, You cannot mod the "Memory Voltage" in Polaris Bios Editor, you can put that number to zero and nothing will change. It does absolutely nothing.

I would suggest reading about what you are trying to do and having an understanding of it because from your post it appears you have no idea (I am not saying that as an insult)

Last but not least, what is your goal exactly because I am not sure what you are trying to accomplish. If you are trying to decrease the wattage used let me ask you a few questions.

1 - How many watts does the GPU currently use? How was it measured? WHat number are you trying to reach?
2 - Are you modifying the straps ?
3 - What settings are you planning on using for the mem and core ?
4 - Are these settings for a single GPU, a rig or many many GPU's

Cheers

Thanks for reply.

1 - How many watts does the GPU currently use? How was it measured? WHat number are you trying to reach?
under 50W. it mod the Memory Voltage on WattTool to 860mV
I want mod Memory Voltage coz use on linux.

2 - Are you modifying the straps ?
Yes, 1500 to 2000

3 - What settings are you planning on using for the mem and core ?
1050MHz / 1900mHz / 860mV stable
I have 470 4gb x 12(480 Sols/s)

That is not correct, you are not using under 50 watts , I promise. Please hook up your rig to the wall with a Kill-A-Watt and measure the watts with 1 GPU mining and then with 2 GPU's mining. I am guessing it is more like 75-100. The number on GPUZ is not for the whole GPU.

In regards to the memory you would need to code that directly into the VBIOS the old school way. The "Memory Voltage" on the PBE is a "dummy" and does nothing.

I think some of the Sapphire have offsets in the VBIOS and the ASUS Strix do as well. The only way to do the others is by hand and it can get very complicated very quickly if you have never done it before.

That is not correct, you are not using under 50 watts , I promise. Please hook up your rig to the wall with a Kill-A-Watt and measure the watts with 1 GPU mining and then with 2 GPU's mining. I am guessing it is more like 75-100. The number on GPUZ is not for the whole GPU.

Yes, Its around 100W per GPU from the wall.

I use WattTool to mod.

Increase 10W ~ 20W both GPU-Z and wall.

so, Can i flash Memory Voltage to 860mV?

No you cannot with Polaris Bios Editor.

No you cannot with Polaris Bios Editor.

without PBE??

Yes you can change the offset doing it with something like this:

Cool. How do i find the place of Memory Voltage?

It is WAY more complicated than just changing it. First if your card doesn't have it (most do not) then you will need to add it to the correct location. Then you need to do things like change the Command/Data Table lengths because you will be adding values to the length of the ROM which essentially changes the location of everything below that point.

Then you need to deal with other issues like adding or subtracting the padding to get the length correct.

That is a VERY simplified explanation.

Thanks. i need to googlig so much!! i will try.