a maximum of 6 graphics cards can be installed on this motherboard. through risers 3 pieces and directly through pci-e. motherboard is good
This MB also has 2 M.2 slots with PCI-e bus. So you can run 8 GPUs with this MB with proper BIOS settings.
I've an experience of running 8 GPUs on Asus z270 a pro when 7 GPUs connected to PCI-e slots and the rest 8th is connected via M.2-PCI-e adapter. And it already works for years)