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Use PCIeX4_3 slot with 2x card

unknownmiscrean
Level 8
I am looking at buying a 2x expansion card to go in my C6H. I know the car is physically and electrically compatible, however since I have 2 other PCIe 1x cards, I am looking to place the 2x card in the bottom 4x slot and only assign 2 PCIe lanes to allow me to use my other two cards in two other 1x slots.

Is this possible? I can't find a BIOS option in 9920, and don't remember seeing one in 1403. I don't want to spend money on a expansion card I can't use...
Thanks.
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2 REPLIES 2

Juanlo_
Level 7
In my experiencie, the PCIeX4_3 slot does NOT work with x4 cards, as I have reported (and other users confirmed) here:

https://rog.asus.com/forum/showthread.php?94701-C6H-problems-with-USB-card-on-PCIEX4_3

However I have tested a 1x card on that slot and it worked fine, so I have no idea about 2x cards. Apparently is something that can be fixed with a BIOS update, but so far it looks like Asus has zero interest on fixing the problem. I'm afraid you will have to try it yourself, and if it does not work, you can:

a) return the card and look for another solution
b) wait for Asus to fix it, like I'm doing

Juanlo_ wrote:
In my experiencie, the PCIeX4_3 slot does NOT work with x4 cards, as I have reported (and other users confirmed) here:

https://rog.asus.com/forum/showthread.php?94701-C6H-problems-with-USB-card-on-PCIEX4_3

However I have tested a 1x card on that slot and it worked fine, so I have no idea about 2x cards. Apparently is something that can be fixed with a BIOS update, but so far it looks like Asus has zero interest on fixing the problem. I'm afraid you will have to try it yourself, and if it does not work, you can:

a) return the card and look for another solution
b) wait for Asus to fix it, like I'm doing


Thanks, I am currently using a 1x card in the 4x slot, and its been fine for a couple of months. Look like I'll hold off for a bit, or until someone can confirm it works. I guess I could try run a video card at 2x or something...

I was going to get one of these (not sure which yet)

https://www.pbtech.co.nz/search?sf=orico+usb+pci