ROG STRIX B850-I M2_1 ssd not recognized with RTX5090

[bugs1]

I am experiencing an issue with my ROG STRIX B850-I GAMING WIFI motherboard where the M.2 SSD in the M2_1 slot is not detected at boot when my new RTX 5090 graphics card is installed.

System Configuration:

• Motherboard: ASUS ROG STRIX B850-I GAMING WIFI, bios version 1028
• CPU: AMD Ryzen 7 9800X3D
• M.2 SSD (M2_1 slot): Corsair MP600 PRO XT 8TB
• Previous Graphics Card (Working): NVIDIA RTX 3090
• New Graphics Card (Issue present): NVIDIA RTX 5090

Problem Description:

• With the RTX 3090 installed, the Corsair MP600 PRO XT in the M2_1 slot is detected correctly, and the system boots without issues.
• After upgrading to the RTX 5090, the system no longer recognizes the SSD in the M2_1 slot during boot.
• If the RTX 5090 is physically removed from the motherboard, the M.2 SSD is detected again, and the system can boot. This confirms the SSD is correctly mounted.
• When booting from a USB stick with the RTX 5090 installed, the graphics card itself appears to initialize and function (display output is fine).

Troubleshooting Steps Taken:

• Confirmed the SSD works with the previous RTX 3090.
• Confirmed the SSD is detected when the RTX 5090 is removed.
• Updated motherboard BIOS to version 1028.

[Silent_Scone]

Hi @bugs1 

Try BIOS 1053

Contains most recent AGESA Combi patch

[bugs1]

thanks @Silent_Scone for helping out with this. Your download link seems broken and I can't find this version on the support page for the mobo. Could you provide an updated link?

[Silent_Scone]

updated link

[bugs1]

Sorry for the delay in responding. Unfortunately BIOS 1053 didn't help and I still suffer from exactly the same issue. Do you know if there's anything else I can try?

[bugs1]

Also note that:

• I'm connecting the graphics card directly to the slot(no riser cable).
• Changing "Advanced/Onboard Device Configuration/PCIE Link Speed/PCIEX16(G5)" to "GEN 4" does not help.

[bugs1 · Accepted solution]

I've been able to figure it out! The backplate of the graphics card was pushing on the heatsink of the ssd. I assume this caused the ssd to electrically disconnect from the motherboard.