I recently helped my stepson put together a new PC, and we're running into a major issue: the motherboard (Gigabyte B850 Gaming X WiFi6E) isn't recognizing his graphics card (Radeon RX 9070 XT). We've tried reseating the GPU multiple times, but no luck. Our next step was updating the BIOS, but that's where we're hitting a wall. We downloaded what we thought was the right BIOS file from the Gigabyte website, but when we attempted the update, we received an error indicating it was the wrong BIOS. The file we found is a .efi file, but we were told we needed a .fxx file which doesn't seem to exist in the download.
3 Answers
Did you verify that the GPU is getting power? Make sure that the power connectors are plugged into the GPU itself, typically 2x8-pin connectors. Also, try using the onboard graphics to at least get into the BIOS and check which version you’re running—look for an 'F5' number labeled somewhere in there. That might clarify if the BIOS is an issue.
It's worth checking all the cables thoroughly. Sometimes it's just about making sure everything is plugged in correctly. That includes the connection from the PSU to the GPU and ensuring the display cable is in the GPU, not the motherboard. Have you followed any guidance from the BIOS download package? Sometimes they include instructions that can help avoid AI missteps.
Absolutely! I just realized we might have downloaded the wrong BIOS update. Looks like we grabbed the one for B850M Rev 1.0 instead of our B850 Rev 1.x. Gonna try updating with the right one.
It sounds like you're off to a good start, but EFI files are not the BIOS itself. They're used during the OS boot process. You might want to check your Device Manager for any devices with warning signs—which could indicate a GPU issue. But if you don’t have an OS installed yet, it’ll be tough to check that.
Thanks for the info! I'm still waiting on my stepson to get out of his meeting so I can check if the GPU fans are spinning.

Good point! We were using integrated graphics to check the BIOS, but I’ll check the fans on the GPU and see what version we're on.