Backward compatibility for x8 cards in x4 PCIE slot? W480/Z490/Z590

[next-Jin]

I have to upgrade my motherboard to use an additional Dell H310 card which is PCIE x8. I've been looking for a motherboard that could do 8/8/8 or something but that's above the lane requirements of the 400 series I think.

Not sure on 500 series but the point is if I get the Dell H310 and throw it in a Asus Pro W480-Ace would it work in the PCIE_5 slot at the bottom?

Possible build:
10900
Asus Pro W480-ACE
1650 Super
2x Dell H310

Should work right?

 

[GiGaBiTe]

It should technically work, but YMMV if the PERC card doesn't support running on fewer lanes than it was designed for. I haven't messed with PERC cards in a long time, but I remember them being notoriously picky about the systems they ran in.

 

[zandor]

Supermicro has a couple Z490 boards with a PLX on them that'll do 8/8/8/8. They also come with a Marvel 10gig NIC integrated. https://www.supermicro.com/en/products/motherboards/desktop-gaming-boards