Help setting up p67 motherboard for mining

Hi can anyone help l can only get this board to see 3 gpus and it has 6 pcie .
Thanks for any help

4g decoding
PCI should be gen 3

Look in your bios documentation

Hi dont have an option to change pcie or 4 g are theses boards able to support any more tan 3 csrds?

What motherboard is it ?

Hi it’s a asus maximus iv extreme p67 1155 (3604 bios) Ive tryed so many diferent combinations and can only get 3 gpus to work.