I actually saw an 11-gpu- mining rig using the exact same motherboard, which it's cool, you could just add more graphic cards to this exact rig, instead of just buying new motherboard, processor, ram, ssd, etc etc
Anywho. Pretty sick rig you got yourself, gratz on that!
I saw it, with the PCIe splitters. For now I just don't trust daisy chaining riser cables - you still need to connect a riser cable from the splitter to the card.