Best motherboard for the Ryzen 7 7800X3D in 2024 - XDA
ASROCK limits the motherboard with two PCIe x16 slots (PCIe 5.0 x16 supporting up to x16 mode and PCIe 4.0 x16 slot supporting x4 mode) and one PCIe 3.0 x1 slot at the end.
Answered: Can I Put a PCIe X4 or X8 Card in an X16 Slot?
A PCIe x16 (x4) slot is a PCIe x4 slot, designed so that PCIe x16 card can also be inserted into the slot an work, albeit running at the slower speed of PCIe x4.
R760 Riser Config 3-1. 2 x16 LP + 2 x8 FH + 2 x16 FH (Gen5) - ECS
Configurations
Expansion card risers
PCIe Slots
Form factor
Controlling processor
Slot's electrical bandwidth/ physical connector
Config 3-1. 2 x16 LP + 2 x8 FH + 2 x16 FH (Gen5)
R1P
2
Full height
Processor 1
PCIe Gen5 x16 (x16 connector)
R2A
3
Low profile
Processor 1
PCIe Gen4 x16 (x16 connector)
6
Low profile
Processor 2
PCIe Gen4 x16 (x16 connector)
R3B
4
Full height
Processor 2
PCIe Gen4 x8 (x16 connector)
5
Full height
Processor 2
PCIe Gen4 x8 (x16 connector)
R4P
7
Full height
Processor 2
PCIe Gen5 x16 (x16 connector)