In an effort to save watts and have fun, I would like to try to make an 8 gpu rig using one of those cpu/motherboard combos that typically have a tdp less than 20 watts.  To run 8 cards, I just need 2 slots feeding 4 way pcie splitter cards.  But I also need the "Above 4g decoding" bios option.  Is anyone aware of any combos that include such?