cdc-951
Okay once resizable bar firmware update comes out, will we get an updated firmware power mod? Can you make a small YouTube video step by step also? I would appreciate that for a really novice.... Please spare me as I did read every single post 

bmgjet
Ill start off by saying you should really just get a 3 plug card if your looking to buy.
I was unlucky after having a STRIX ordered then the store canceling my order and giving my the option of a 3090 XC3 and $400 refund or wait 3-5 months so thats what I got.
But anyway here is how I went about making this card not so terriable.

First off getting a base line for this card.
Benchmarks put it about 1-2% better then a high end 3080. (Which you dont want to see when you just spent 1K more then one of those cards and you see the high end 3090 doing 10-15% better)
It was unable to hold its advertised 1725mhz clock since it was just always slamming against 350W power limit.

Theres currently 4 threads on here from others complaining about the same thing, "Low XC3 scores".
The powerlimit is 100% the issue, The only way to fix this is to flash a higher power limited bios.
From my testing the KFA2 390W bios is the best one for the card since its VRM and Fan design matches EVGAs and you dont lose a DP like the Gigabyte Gaming OC 390W bios.
There is also the 1KW EVGA XOC bios. Its a 3 plug bios so the readings you get in software will be wrong by 33%.
(This is why using a 3 plug bios results in less power making the 480 and 520W bios useless)

Here is the data from testing.

Notes: Make sure you set a lower power limit if you decide to go the XOC bios you will also want to set a custom lower power profile to switch to at idle since there is no idle clocks for the vram.
If using the KFA2 bios on 390W youll want to set a custom fan profile. The stock profile has the fans only getting to 75% at 80C if you set a custom profile with them ramping to 100% at 80C then youll end up around 72C.
I was unable to test the XOC bios in competely stock cooling layout since I had already removed the cooler and re-pasted by the time that bios was released.

What you can see from the graphs is performance is tied to power usage and scales very well with more power. Realisticlly we cant expect any offical bios higher then 390W since thats already pushing out of the ATX spec limits, (Even tho Nvidia does 400W with 2X 8pins).
Also the stock cooler isnt as bad as people make out. The fan profile just needs to be a bit more agressive. There are also gains to be had by repasting the card but be aware this will destroy the thermal putty on the inductors and likely rip the thermal pads on the vrm and vram so make sure you have some new ones to go on just incase.

So on to flashing.
IMO this will void your warranty but Forum Mod Sajin has said in other posts as long as you flash back the orignal bios before sending the card back it will still have warranty.
If the card is unable to boot to windows to flash it you can use a external programer like ch341a with 1.8V and SOP-8 clip adapter.
The bios chip can be found between the pci-slot and die and its part number is MX25U8033E.


I have made a tool that lets you extract/embed your own bios into to EVGA update.exe bios flasher so no need to mess with nvflash and command line.
This tool can be found here.
https://github.com/bmgjet/EVGA-Bios-Unpacker

Alternativly here is a 390W update.exe already modded.
https://mega.nz/file/OLhR...LpkO7KiXybdLA7ul6nGJrM
I wont provide the 1KW XOC already modded since that is really a risk to your card if your not careful.

Simply run the exe. It will tell you your going to update your bios and press Y.
Then it will say the boards miss match and do you want to continue press Y again then restart your computer.

Since this is not a bios from EVGA the LED control will stop registering in PercisionX1.
Here is the fix for that.
https://github.com/bmgjet/EVGA-GPUINFO-Editor

You need to edit the GpuInfo.bin file to add the different device id of this bios in place of what you want the card to identify as.
Theres a video sort of showing how this is done here.
https://www.youtube.com/watch?v=6HgMYBYE3RQ
Then you need to replace the Library.dll file since it has a lock out for any cards not matching EVGA device ID. You can find info and download link for that on the same github as the GPUINFO Editor.
And thats it.

Enigma_One
I was successfully able to repatch the new KFA2 rom using your extraction tool. I now have RBAR with the 390W power limit on my xc3. Everything seems to be working well, many thanks!

bmgjet
Heres a 390W version bios with RBAR support.

Its got higher base boost tho.

bmgjet

undecided65
How is this being cooled? Do you have the fans at 100%? My 3080 XC3 fans were basically at full throttle while gaming with stock settings so I don't know how a 3090 XC3 with extra watts could possibly stay cool.

Something wrong with the heat sink mount and thermal compound on your 3080 then.

• No hardware mods necessary
• AFAIK, there is no ability to edit Nvidia's encrypted bios in the wild
• Really don't need to limit to 500w with the PL.  It will hit the default voltage limit at 500w or less in most games.  (some exceptions maybe be Quake2 RTX, etc... with full ray tracing)
• No reBar XOC in the wild.  EVGA is trying to keep a lid on it this time from what I've read.

Enigma_One
I was successfully able to repatch the new KFA2 rom using your extraction tool. I now have RBAR with the 390W power limit on my xc3. Everything seems to be working well, many thanks!