No boot with both x16 slots populated

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   On my x570 Steel Legend with a Ryzen 5950 CPU I have a problem booting with both an MSI 4080 Super and a Mellanox ConnectX-3 in the x16 slots.

With only the MSI card the system boots just fine. When I plug the ConnectX-3 into the other x16 slot the system stops with the VGA LED on. I tried setting the PCIe lanes to 1x8, 2x4, without success. When I pull the Mellanox card the system boots normally. The Mellanox card works by itself with an older graphics card (GTX-980). 

Is this a BIOS issue or is there a fundamental problem with the RTX and an x4 card?

Thanks!

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trggrhppylmbx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 Apr 2024 Status: Offline Points: 50	Post Options Post Reply Quote trggrhppylmbx Report Post Thanks(0) Quote Reply Topic: No boot with both x16 slots populated Posted: 04 Apr 2024 at 11:20am
	On my x570 Steel Legend with a Ryzen 5950 CPU I have a problem booting with both an MSI 4080 Super and a Mellanox ConnectX-3 in the x16 slots. With only the MSI card the system boots just fine. When I plug the ConnectX-3 into the other x16 slot the system stops with the VGA LED on. I tried setting the PCIe lanes to 1x8, 2x4, without success. When I pull the Mellanox card the system boots normally. The Mellanox card works by itself with an older graphics card (GTX-980). Is this a BIOS issue or is there a fundamental problem with the RTX and an x4 card? Thanks!

trggrhppylmbx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 Apr 2024 Status: Offline Points: 50	Post Options Post Reply Quote trggrhppylmbx Report Post Thanks(0) Quote Reply Posted: 04 Apr 2024 at 11:21am
	Forgot to add, the RTX of course is Gen 4, the Mellanox is Gen 3 PCIe

trggrhppylmbx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 Apr 2024 Status: Offline Points: 50	Post Options Post Reply Quote trggrhppylmbx Report Post Thanks(0) Quote Reply Posted: 06 Apr 2024 at 9:29am
	It works with the Mellanox in an x1 slot. Not ideal, but at least a temporary solution. I'd still appreciate any insight.

M440 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 12 Jul 2023 Status: Offline Points: 2080	Post Options Post Reply Quote M440 Report Post Thanks(0) Quote Reply Posted: 06 Apr 2024 at 7:09pm
	when you run the 980 + lan card, which pcie version were those running? do you have a pcie version setting for the slots in the bios? Edited by M440 - 06 Apr 2024 at 7:10pm
	asrock b650m/hdv.m2, ryzen 7700x@85watt