Question Why slot PCIEX16(G4)_1 shows "Not present"?

May 23, 2023
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Why slot PCIEX16(G4)_1 shows "Not present"?

Motherboard: ROG STRIX Z790-A GAMING WIFI D4
Processor: I9-Intel 12900K
Graphic Card: RTX 3090 Founders Editions
Memory: 64 GB DDR4
OS: Windows 11 Home

I wonder why in ASUS UEFI BIOS under Advanced \ PCH Configuration \ PCI Express Configuration slot PCIEX16(G4)_1 shows "Not present"? This applies to the second slot as well.
My graphic card seems to work fine. My monitor works and motherboard recognise (after around 30 sec.) that HDMI is connected to the GPU. Boot is set up to Windows EUFI.
The only problem that I can see is that I cannot set up GPU as my primary source. Even if I do this, BIOS cycle through different connections but finally manage to find HDMI.

Shouldn't be information in the system about rtx 3090 under PCIEX16(G4)_1?
Does it have any serious impact, can I ignore it if everything works?

 
Last edited:
May 23, 2023
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Do you have your graphics card installed in PCIEX16(G4)_1 ?
It should be in PCIEX16(G5). That's the upper PCIE x16 slot.

PCIEX16(G4)_1 is in the middle of the board and
PCIEX16(G4)_2 is at the bottom.
Do you have any cards installed in those slots?

Anyway - you should read user manual of your motherboard.
Thank you for the questions. Yes, it is in the upper PCIE x16 slot. I checked in Windows and it also shows that the graphic card is installed under slot 1. I attached the screenshot from BIOS.
 
May 23, 2023
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I think that I found what PCH Configuration does. According to BIOS manual

"The items in this menu allow you to change the PCIe configurations for slots supported by the PCH."

I assume that PCH Configuration allows to set speed for devices connected to the Intel chipset (Intel z690 chipset). For example my NVMe is shown because it goes via chipset. On the other hand, graphic card is connected directly to the CPU and this is why I don't see it in this menu.
 
May 23, 2023
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Do you have the latest system BIOS installed for your motherboard ? Version 0904, dated 2023/04/11. If already updated then try clearing your CMOS/BIOS settings to default value and then the BIOS entries once again.

Just see what happens when you reset the BIOS settings to default ?
thank you for helping. I tried clearing CMOS but the result was the same. I think that I found the solution (comment above).