Solution Asus tuf rx 6800xt AGA Z01G GPU does not turn on

Hi, sorry for my English translated with google translator but I don't speak English.
After searching hundreds of forums I could not find a solution to my problem so today I bring you the solution that worked for me and currently my system works perfectly.
buy an AGA on ebay new model Z01G worked with a rtx2080 without problems was detected immediately.
the problem started when i bought an asus tuf rx 6800xt. the gpu does not turn on. no rgb, no fans, no cable light. obviously impossible to detect in device manager. I tried everything with no results. the strangest thing is that with nvidia gpu if it worked.
I am an electronic engineer and I have specialized for 15 years in microcontrollers, robotics and assembly line processes. So I decided to reverse engineer AGA. Since I did not understand why with nvidia gpu if it worked but with 6000 series gpu not.

After analyzing the AGA controller board, I realized that the energy management is controlled by a firmware integrated into a flash chip. This is responsible for detecting the pci port in search of the gpu when it is properly detected, it sends a signal to 2 regulators that provide the 3.3v and 12v voltages that the gpu needs to work.

For some reason dell does not allow its firmware to provide voltages to the pci port when the asus tuf 6800xt is connected, I do not know if it has a defective AGA, or a gpu with an unsupported Vbios. but taking into account that pci voltage do not change between brands or generations from pcie 3.0 to 4.0, I decided to make the following modifications to the AGA

1. Override the AGA firmware power management (as shown in the photos)
solder J511 and J512 on the board
J511 enables 12v voltage
J512 enables 3.3v voltage





2. enable GPU power-up by soldering a cable as shown in the picture




With these 3 modifications the GPU turns on with the power supply and it is not managed by the AGA firmware, we will not have problems we are only enabling the voltages directly that are present in the pcie port I have been testing the AGA with this modification for 2 weeks and It works perfect.
at this moment your asus rx 6800xt already turns on and is detected in the device manager with a yellow symbol with error code 31 to solve this do the following.

1. Click Start, type regedit in the Start Search box, and then click regedit in the Programs list.
   
   If you are prompted for an administrator password or for confirmation, type the password, or click Continue.
   
   
2. Locate the following registry subkey, and then click it:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\PnP\Pci
   
   
3. If the HackFlags registry entry is not present, follow these steps:
   
   1. On the Edit menu, point to New, and then click DWORD (32-bit) Value.
   2. Type HackFlags, and then press ENTER.
   3. On the Edit menu, click Modify.
   4. In the Value data box, type 200, click Hexadecimal in the Base area, and then click OK.
   5. Exit Registry Editor.
4. If the HackFlags registry entry is present, follow these steps:
   
   1. Right-click HackFlags, and then click Modify.
   2. In the Value data box, type 200, click Hexadecimal in the Base area, and then click OK.
   3. Exit Registry Editor.

restart your pc with the AGA connected. Your asus tuf 6800xt will be detected, install the AMD drivers and enjoy your gpu. After these modifications the AGA will detect all the cards. nvidia and amd.

with my 6800xt running I tested temperatures and I did not feel comfortable with the temperature of the component in charge of managing the pcie rails. install a small heat sink so I reduced the temperature of this component by a few degrees



thermal image



the power source included in the AGA is garbage. had coil noise and the voltages dropped below 12v immediately replace the power supply with a corsair rm750x.



I did tests with 1 split cable and 2 power cables. the results were interesting.
1 split power cord produces a slight voltage fluctuation at the 12v output and in furmark the score is reduced.

with 2 cables there is no voltage fluctuation and I see an improvement in the furmark score, so I decided to install 2 cables from the power supply

1 split cable



2 cables




thermal images running warzone 45 minutes




AGA warzone 4k ultra settings consumption




finally customize my AGA install RGB corsair and 2 fans that reduced the temperatures by about 9 degrees Celsius.
I plan to later install everything in a custom box cut out of aluminum. but for the moment I am very satisfied with the results of the modification and now I can enjoy the games in 4k on my 48-inch LG C1. all this connected to an alienware area 51m R2 laptop

final images

 

This is amazing!

With the forum being sunsetted, you need to post this elsewhere for continuity (in another forum). It would be an extreme shame that this disappears from the web.