x470 pcie lane issues with matisse

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   Hello. I am facing some problems with pcie lanes in my current Taichi ultimate x470 build.

Specs here:
- Taichi ultimate X470 (with BIOS P3.30)
- Ryzen 3900X 12-core 24-thread
- Nvidia MSI GeForce GT 1030 2GB LP (PCI-e 3.0 x16)
- Dell Perc H310 in IT-mode (PCI-e 2.0 x8)

I started my build with some earlier BIOS version and Ryzen 1700, and updated the BIOS to P3.30 by following the instructions. Then I upgraded the CPU to the Ryzen 3900x and the system was working.

The GPU was installed on the PCIE1 slot and it was working. Then I added H310 card to the PCIE3 slot and I couldn't get image to the screen from the GPU at PCIE1. I read about the pcie-lanes on this motherboard and I realized it has some auto feature which turns PCIE3 and PCIE1 to x8 mode if there is card in both of these slots.

But as far as I am aware the GPU should be working even if it's 8x lanes. I tested the GPU by putting it into the PCIE5 slot (which has x4 slots) and it worked without problems.

In the last test I set the GPU alone in the PCIE3 slot and got no image. 
Could this be something related to the BIOS or faulty pci-e lane? Or am I just missing something?

Greetings Polpo

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polpo Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 08 Nov 2019 Location: Finland Status: Offline Points: 4	Post Options Post Reply Quote polpo Report Post Thanks(0) Quote Reply Topic: x470 pcie lane issues with matisse Posted: 08 Nov 2019 at 4:26pm
	Hello. I am facing some problems with pcie lanes in my current Taichi ultimate x470 build. Specs here: - Taichi ultimate X470 (with BIOS P3.30) - Ryzen 3900X 12-core 24-thread - Nvidia MSI GeForce GT 1030 2GB LP (PCI-e 3.0 x16) - Dell Perc H310 in IT-mode (PCI-e 2.0 x8) I started my build with some earlier BIOS version and Ryzen 1700, and updated the BIOS to P3.30 by following the instructions. Then I upgraded the CPU to the Ryzen 3900x and the system was working. The GPU was installed on the PCIE1 slot and it was working. Then I added H310 card to the PCIE3 slot and I couldn't get image to the screen from the GPU at PCIE1. I read about the pcie-lanes on this motherboard and I realized it has some auto feature which turns PCIE3 and PCIE1 to x8 mode if there is card in both of these slots. But as far as I am aware the GPU should be working even if it's 8x lanes. I tested the GPU by putting it into the PCIE5 slot (which has x4 slots) and it worked without problems. In the last test I set the GPU alone in the PCIE3 slot and got no image. Could this be something related to the BIOS or faulty pci-e lane? Or am I just missing something? Greetings Polpo

Ray62 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 01 Jul 2018 Location: Germany, Berlin Status: Offline Points: 706	Post Options Post Reply Quote Ray62 Report Post Thanks(0) Quote Reply Posted: 08 Nov 2019 at 6:08pm
	You have to switch the two PCIe slots in 2x8 mode in the bios, i think. Should be under Advanved\AMD PBS\PCIe x16/2x8 Switch
	Asrock Fatal1ty X370 Professional Gaming Offline Under test: MSI X570_MEG_ACE \| AMD Ryzen 9 3900X \| Scythe Mugen5 \| 2x16GB F4-3200C14D-32GTZ@3466 \| ASUS GeForce GTX 1080 Ti FE

polpo Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 08 Nov 2019 Location: Finland Status: Offline Points: 4	Post Options Post Reply Quote polpo Report Post Thanks(0) Quote Reply Posted: 09 Nov 2019 at 3:28am
	Problem solved with the help of comment above. Some notes what happened: - I switched to 2x8 mode and booted with 2 pcie cards attached. It cleared bios settings for some reason and could not get image to screen. - Switched again to 2x8 mode and set some of the other settings at the Advanced\AMD PBS\ to auto and it started working. Thanks!