RX 6800 XT

[sphinx84]

Hi, guys. Recently I was purchased this card but she display in my system like PCI-E x8 (not x16). Is this even normal?

I heard something about a named frame buffer - Do I need it?

My config:

i5-10400f / MSI B460 Tomahawk / 2x8 GB DDR-4/ Gigabyte Gaming OC RX 6800 XT/ Clover 5146 - Big Sur latest

Boot arg for card agdpmod=ignore but sometimes I have the black screen. 

 

 

 

EFI.zip

[Slice]

x8 or x16 is written into SMBIOS. It may be just a mistake of OEM.

You may correct it by Clover functionality

<key>Slots</key>
<array>
  <dict>
     <key>Device</key>
     <string>ATI</string>
     <key>ID</key>
     <integer>0</integer>
     <key>Name</key>
     <string>AMD Radeon RX6800</string>
    <key>Type</key>
    <integer>16</integer>
  </dict>
</array>

https://github.com/CloverHackyColor/CloverBootloader/wiki/Configuration#slots

but I am not sure if it will influence on something or it is cosmetic only.

[mariosun]

@sphinx84Are you sure that your PCIE slot (where you have your GPU) is not shared with others components installed in your PC?

ie NVME disk or other PCIE cards

[sphinx84]

@mariosun no, here is screenshot from gpu-z

 

[mariosun]

yep @sphinx84it says the same you see in OSX

I think some devices share PCIe lanes in your system

it is not a problem of your GPU 

[fantomas]

@sphinx84

 

Hi,

 

gpu-z shows bus interface: PCIe x16 4.0 @ x8 3.0

 

your gpu is PCIe 4.0 and your motherboard only supports PCIe 3.0, so your gpu will only work in x8 mode. Either you buy a PCIe 3.0 gpu that supports x16 mode to see it working in x16 mode with your motherboard or you buy a PCIe 4.0 motherboard that supports x16 mode and your gpu will work in x16 mode.

 

 

[sphinx84]

Thanks guys. I read about the difference between Gen 3 and Gen 4 and look at the motherboard's bios (Gen 1-3 or Auto).