I'm trying to set the pcie bifurcation option on an x16 slot to x4x4x4x4. I've updated to the latest BIOS (3.3) and the options are present in BIOS but when I try to change the option from x16, the only choice is x16. All the other slots are the same - they only have the one option they are currently set to. I've read a ton of other posts and material with people getting bifurcation to work properly on X9 boards but I've never seen anyone with my exact model of motherboard (x9dr7-ln4f). Anyone know if theres an issue with this board in particular or if maybe I'm doing something wrong or missed something?