3 Things to Know About the ASUS ROG STRIX Z690-A PCIe Slots
Both x16 slots run at PCIe 5.0 The primary slot runs at full x16 bandwidth, while the second slot runs at x4. This is unusual for a Z690 board and gives you two future-proofed slots.
The second x16 slot is limited to x4 electrical lanes Despite being PCIe 5.0, the second slot only provides four lanes. It is not a full x16 slot, so do not expect full bandwidth for a second GPU.
There is one PCIe 3.0 x1 slot This slot is for smaller add-on cards like sound cards or network adapters. It is not suitable for high-bandwidth devices.