Graphics Cards

[Spectre73]

I am running the above combo on a MSI B550 Unify-X board and no matter what I set in the BIOS the system never reports or uses PCIe 4.0 connection speed. Even after a complete CMOS reset and a fresh boot the system never runs at advertised speeds.

System Specs:

MSI B550 Unify-X (AGESA 1.2.0.3a - BIOS A.32)

PCIe_1: RX 6800 XT @x16 3.0 (no riser)

M.2_1: WD SN850 @ x4 4.0 (works flawlessly)

M.2_4: ADATA 8200 Pro @ x4 3.0 (as expected)

PSU: Seasonic Prime Ultra 750W

Troubleshooting steps so far:

- reseated the CPU and checked for bent pins

- reseated the GPU 4 times

- placed the top SSD (CPU lanes) in a different slot

- changed BIOS settings, like Global-C-states and tried to force PCIe gen 4 on the first PCIe x16 slot

In essence, nothing works, the GPU is a brand new AMD reference model. I do not believe the GPU to be the problem, but one can never be sure....

[goodplay]

Does your mobo bios system settings device info show pcie x16 @ 16 x 4.0.

Check your pcie x16 slot config is 4.0, not the separate pcie slot config option (mines on auto for that one)

[Spectre73]

It is. The seperate option is for the chipset link. With B550 it is not possible to select more than gen 3 here (ignore the BIOS version, it is A.32 now).

 

[goodplay]

What App. is reporting only 3.0 (under load or idle).

[Spectre73]

GPU-Z as well as HWInfo64.

[goodplay]

Must be some mobo bios setting amiss ?, do you have a pcie x16 bifurcation settings option.

You might want to try posting your issue on the MSI forum.

[Spectre73]

Thank you. It is no bifurcation setting, since I did not use it. Further, with bifurcation active, there would be no x16 3.0 speed on PCIe_1.

I already posted at the MSI forum. Seems, no one really can help. I am completely out of ideas.

[goodplay]

Looks like you need to put in a tech support ticket with msi, see if they can help.

Not used an msi board myself.