AMD Radeon RX 7800XT - not working on intended platform

[luke95]

Hallo Together,
since my situation is quite unique, and therefore is quite hard to search for. I decided to write this thread.

The Parts​

A friend of mine wanted to buy a new PC, manly for video editing and creative work.
CPU: AMD Ryzen™ 9 7900
Motherboard:MSI PRO B650-S WIFI
RAM:96GB G.Skill F5-5200J4040A48GX2-FX5
GPU:XFX AMD Radeon RX 7800 XT
PSU: 850W be quiet! Pure Power 12 M
System SSD:WD Black SN770 1TB
Bulk SDD:Lexar SSD NQ790 4TB
The Part selection looked OK, the CPU was chosen since it was heavily discounted. With a clear future path for some 9xxxX3D, if necessary.
After checking with me on the selection he asked if I could assemble it for him.
All parts where ordered on mindfactory.de

The Build​

So yesterday I tried building this system.
To avoid bad luck first on MB-Box, everything worked fine only the GPU isn’t working, the EZ Debug LED is glowing white which indicates GPU issues.
Lucky me the 7900 is capable of driving a display and the GPU is easily exchangeable.
So I build the system fully in the Corsair case and install Windows 10 Pro on the system SSD (the OS selection was from my friend).

First fixes​

Now onto fixing the GPU.
First I though the issue was due to insufficient power so I tried to connect the two different 12V rails of the PSU. I made sure the GPU was seated correctly.
Maybe a BIOS update on the Motherboard will help.

Different GPUs​

I try another GPU, a RX6600 from Gigabyte it works, but this GPU only uses a PCIe Gen 4x8 connection, so to conform the slot is able of connecting via PCIe X16, I dig for my first GPU I bought, a GTX660Ti also from Gigabyte, it works in PCIe Gen 3x16. I even try my encoder card an ASRock ARC A380, they all are working fine. In my perplexity I ask another friend for help. By pure chance he has the same RX7800 XT, and after trying this card I’m sure: The RX7800 XT is DOA.

DOA – are you sure ?​

But I want to make sure, since I figure if I RMA the RX7800 XT my seller will conform, if the card is actually dead. So I plug it into the system I took the RX6600 from (R7 5800X, 4 x 8 GB DDR4-3200, B550M AORUS PRO-P). Surprise the RX7800 XT is working just fine, in this system.

Any suggestions​

Since I have the card running now, should I try flashing another V-Bios (currently: 022.002.001.026.000001) , or are there other steps I could take to get the RX7800 XT running on the intended system.
For context I’m a electrical engineer, doing hardware design, but I work in an industrial context and lack therefore PCIe knowledge.

 

[Tatty_Two]

Do you have the latest Bios for the motherboard installed? I only ask because after a little digging I see there have been some issues with a couple of the Boards AGESA updates in the past, some where the card won't work at all and some others where they can get the card to display on startup but then they lose it again.

 

[FreedomEclipse]

Try this out... plug in a working card, boot up and Go into the bios and manually set the pcie version to 3.0 or 4.0 (just as a test) then restart/power off then swap the working card with the 7800XT and try booting up.

Sometimes some GPu's wont work or perform correctly because of this. Its rare that it happens but I have come across it myself.

also if your 7800XT has an 'dual bios' - one for performance mode and the other for quiet mode. Try flipping the switch to the other bios and see if there is any change. The bios on one of them could well be corrupt.

 

[AusWolf]

Do you have the latest Bios for the motherboard installed? I only ask because after a little digging I see there have been some issues with a couple of the Boards AGESA updates in the past, some where the card won't work at all and some others where they can get the card to display on startup but then they lose it again.

This I have the m-ATX version of the same board, and I can tell you, the factory bios gave me nothing but trouble.