AMD RX 6800XT stuck at PCIE 3.0 x16 instead of 4.0

[Fire_x]

Hello everyone!
I build a PC with:
Ryzen 7 5800x processor,
x570s MSI MPG Tomahawk
and with a GIGABYTE AORUS Radeon RX 6800 XT MASTER 16G.

My problem is that the actual buslane is stuck at 3.0 when the bus type on my motherboard is obviously 4.0.
I tried this VGA in 3 different motherboards so the mobo can't be the problem I think.
In the BIOS I switched the PCI-E type to GEN4 but the problem is still unsolved.
I would highly appreciate if some one could help me with this because no other forum discussed this before.

I attach the pictures from GPU-z and from AMD Adrenaline (sorry I don't know how to switch the language to English)

Thanks!

 

[FreedomEclipse]

Have you tried pulling the plug and flipping the bios battery for a full reset?

Sometimes bios's can get bugged out and require a reset like that. Could also be a bug with Windows 11 if thats what youre running.

 

[ir_cow]

If you already went into the BIOS and forced it, @FreedomEclipse might be right and your system is bugged. Clear CMOS and see if that fixes it.

 

[metprism]

I would recommend updating the bios of the motherboard because from my experience msi motherboards need a bios update in order for the pcie lanes to run at gen 4 by 16 lanes. I have a msi z590-a pro motherboard with a 10700k and 3070 ti and before I updated the bios it was running at gen 1.1x16 and when I updated the bios it went to gen 3x16. It would run at pcie gen 4x16 but 10 gen intel cpu's don't run at pcie gen 4

 

[Fire_x]

Have you tried pulling the plug and flipping the bios battery for a full reset?

Sometimes bios's can get bugged out and require a reset like that. Could also be a bug with Windows 11 if thats what youre running.

Yes that was one of the first thing i did but still nothing changed.

I would recommend updating the bios of the motherboard because from my experience msi motherboards need a bios update in order for the pcie lanes to run at gen 4 by 16 lanes. I have a msi z590-a pro motherboard with a 10700k and 3070 ti and before I updated the bios it was running at gen 1.1x16 and when I updated the bios it went to gen 3x16. It would run at pcie gen 4x16 but 10 gen intel cpu's don't run at pcie gen 4

I updated to the newest bios and still stuck at 3.0 x16

 

[ZoneDymo]

interesting problem, luckely its not going to really affect your performance but still.

I take it you tried the gpu in the top slot with no other pci slots used, not by cards nor NVME drives?

 

[oobymach]

It's a hardware issue so either return the mobo or live with it. I would suggest returning it as your gpu supports resizable bar and so does your cpu so you might be losing performance with the stuck pcie 3.0

 

[ir_cow]

It's a hardware issue so either return the mobo or live with it. I would suggest returning it as your gpu supports resizable bar and so does your cpu so you might be losing performance with the stuck pcie 3.0

I had the opposite once. RX 5700 XT wouldn't run in PCIE 4.0 without going into post-fail on the X570. RMAed the card, got the new one and it worked just fine. I was able to test it in a second computer though. Not many have that ability to do so.

 

[Shou Miko]

Have you tested with other PCI-E 4.0 graphics cards with the cpu and motherboard to see if they will run at the correct link?

If so, well a wild shot would be test in the second PCI-E 4.0 x16 slot to see if makes the GPU run 4.0 and yes I know it's from the chipset but for testing it doesn't hurt.

If the above work then try to reseat your Ryzenn 7 5800X and try to clean the PCI-E slot.

If not do as @ir_cow RMA the card sadly.

I have my third RX 6800 XT now and never had this issue, first was the MSI Gaming X Trio, second was AMD reference and now PowerColor's Red Devil.

 

[metprism]

Have you tried running the gpu-z stress test or tried running a game while having gpu-z open to see if the bus lanes change from pcie gen 3x16 to pcie gen4x16 lanes

 

[Fire_x]

interesting problem, luckely its not going to really affect your performance but still.

I take it you tried the gpu in the top slot with no other pci slots used, not by cards nor NVME drives?

Yes i took it all out but the processor should be able to run them both and also nothing

 

[Mussels]

Hello everyone!
I build a PC with:
Ryzen 7 5800x processor,
x570s MSI MPG Tomahawk
and with a GIGABYTE AORUS Radeon RX 6800 XT MASTER 16G.

My problem is that the actual buslane is stuck at 3.0 when the bus type on my motherboard is obviously 4.0.
I tried this VGA in 3 different motherboards so the mobo can't be the problem I think.
In the BIOS I switched the PCI-E type to GEN4 but the problem is still unsolved.
I would highly appreciate if some one could help me with this because no other forum discussed this before.

I attach the pictures from GPU-z and from AMD Adrenaline (sorry I don't know how to switch the language to English)

Thanks!

Are you running a riser cable?

 

[ArtTav83]

I have the same issue as him. Gigabyte RX 6800 XT aorus master and X570 Tomahawk motherboard. It seems MSI did a firmware update after agesa 1.1.0.0 patch D (initial zen3 release) and then after their "fix" on the AGESA for usb dropouts (AGESA 1.2.0.2) then the PCIE4x16 for this particular graphics card combination defaulted to 3x16 and MSI simply drop out on the matter. I have not analyzed what happens if I remove the SSD from second slot to see what happens. Not sure if OP also has something similar like two m2 ssds, 3.0x4 with Gigabyte RX 6800 XT as primary graphics adapter.