motherboards with 6 pcie slots
List of Motherboards with 2 RAM Slots
4x PCIe 4.0 M.2 Slots. ... GIGABYTE motherboards use the best components and reinforce every slots to make each of them solid and durable.
Newegg ASRock X670E Taichi AM5 EATX Motherboard. 4xDDR5 slots ...
GIGABYTE Z690 Motherboards are ready to work with the upcoming PCIe 5.0 devices which are expected to experience double bandwidth than the current PCIe 4.0 devices.
List of Motherboards with 2 PCI-Express x16 Slots
I have a friend building some research pcs with dual RTX 3090/4090 GPUs over the AM5 plataform, and have been finding that most motherboards have a layout with 1 PCIe x16 slot + 1-2 other x16 slots with only x4/x1 modes available.