RTX 4080 Laptop VBIOS values and editing

[SuperMG3]

Hello again.

 

I have an RTX 4080 MXM card. My laptop is a Clevo P570WM that can handle max to 115W of heat.

 

The MXM card can use up to 150W. On GPU-Z it says max 150W too. The max temperature before thermal throttling is 83C which is annoying.

 

I just wanted to know where I can find the value (inside the file) for the TARGET LIMIT of the TDP and the MAX THERMAL LIMIT in celsius.

 

I want to set the max target limit to 115W and the max thermal limit to 87C.

 

I can't flash any random 4080 laptop VBIOS because my card has MICRON VRAM chips. It means, every VBIOS available on the net only use Hynix/Samsung combo, no Micron available.

 

I know unsigned vBIOS without the correct checksum won't work. I do own a CH314A for flashing tho.

 

I just want to know if someone knows how to VBIOS mod the TDP limits and thermal limits. I know someone edited the vBIOS of an RTX 3060 Ti Ampère but he didn't explain how sadly...

 

So if any of you knows, please write it down.

 

Thanks.

 

[SuperMG3]

I'm a little bit late.

 

Actually, the vBIOS is uploaded on techpowerup. It's the "X-Vsion 4080 12GB".

[SuperMG3]

Anyone please?

 

TheDidgeridooMan aka the RTX 3060 TI modder, are you alive?

 

I don't understand a single crap when reading the file in hexadecimal... No way to convert hex to readable language? Like C/C++?

 

Even the manufacturer ignores my request... (Despite I told them I wanted to pay for a modified VBIOS )

 

No hardware mods needed to decrease the target TDP and to increase the thermal limit...

[Khenglish]

You're not going to be able to reduce the TDP with a modded vBIOS. A modded vBIOS will have an invalid digital signiture and the card will refuse to run.

 

There likely are other unmodded vBIOS you can flash on your card. The memory configuration is set by a set of 3 pairs of resistors on the card. Micron, Hynix, and Samsung all have different physical programmings. vBIOS often have the same encodings between vendors, so there are likely other vBIOS that are compatible despite the card the vBIOS being intended for never having Micron vRAM. It is dangerous to experiment with flashing other vBIOS though through nvflash without having a physical programmer. nvflash will often let you flash in one direction, but refuse to let you flash back due to board ID mismatch, so you can brick the card trying this.

 

Another option is to remove and replace the current measuring shunt resistor on the card. There will be a 5mOhm resistor that you could replace with say a 6mOhm resistor for a 17% power reduction. This is a big resistor though that most soldering irons are not strong enough to remove.

[SuperMG3]

1 hour ago, Khenglish said:

You're not going to be able to reduce the TDP with a modded vBIOS. A modded vBIOS will have an invalid digital signiture and the card will refuse to run.

 

There likely are other unmodded vBIOS you can flash on your card. The memory configuration is set by a set of 3 pairs of resistors on the card. Micron, Hynix, and Samsung all have different physical programmings. vBIOS often have the same encodings between vendors, so there are likely other vBIOS that are compatible despite the card the vBIOS being intended for never having Micron vRAM. It is dangerous to experiment with flashing other vBIOS though through nvflash without having a physical programmer. nvflash will often let you flash in one direction, but refuse to let you flash back due to board ID mismatch, so you can brick the card trying this.

 

Another option is to remove and replace the current measuring shunt resistor on the card. There will be a 5mOhm resistor that you could replace with say a 6mOhm resistor for a 17% power reduction. This is a big resistor though that most soldering irons are not strong enough to remove.

Hello. I already said in the post that I know I can't flash unsigned vBIOS but I still want to know where the values are in the vbios file.

 

I managed to lower the TDP using the Nvidia driver bug from version 528.49 but it means I can't use the latest drivers anymore...

[panda_zzz]

5 hours ago, SuperMG3 said:

still want to know where the values are in the vbios file

No one knows that. The firmware itself is encrypted and signed - two layers of protection. There was no information in the public domain about bios modification since the Turing generation.
So you have a choice to drop  tdp via msi afterburner or try different versions of the bios suitable for the chip in your video card

[SuperMG3]

8 hours ago, panda_zzz said:

No one knows that. The firmware itself is encrypted and signed - two layers of protection. There was no information in the public domain about bios modification since the Turing generation.
So you have a choice to drop  tdp via msi afterburner or try different versions of the bios suitable for the chip in your video card

I use Nvidia inspector but I am limited because I can't install new drivers...

[Khenglish]

Since you have a programmer it's fairly safe to try other vbios. The memory strap ID on your card will likely select Micron memory settings despite whatever Techpowerup says the vbios is for. For vbios that don't match you'll likely get a brick or error 43, but you can just use your programmer to flash back.

 

The vbios chip will be 1.8V, so make sure your programmer has an adapter to step 3.3v down to 1.8v.

[SuperMG3]

4 hours ago, Khenglish said:

Since you have a programmer it's fairly safe to try other vbios. The memory strap ID on your card will likely select Micron memory settings despite whatever Techpowerup says the vbios is for. For vbios that don't match you'll likely get a brick or error 43, but you can just use your programmer to flash back.

 

The vbios chip will be 1.8V, so make sure your programmer has an adapter to step 3.3v down to 1.8v.

Yes I have a 1.8V adapter. X-vision is trying to understand how I managed to limit the power using drivers.

[SuperMG3]

@Khenglish

@panda_zzz

 

Since the driver 528.49 can allow power limiting for laptops.

 

But the latest can't allow it on laptops, only desktops can.

 

Is it possible to hack the new drivers and allow power limiting? We need to find the file that allows the power limit adjustments