Do NOT power more than 1 card with the same string of molex or sata connectors if you're using cards without a 6 pin. Even with 6 pin, only power 2 at max.
... and if you have all GPUs with 6 PIN power connectors, can we use ribbon risers instead?
6 x 750ti rig, on pro bt h81 here, just plugged the two molex(from the same psu) and then the 6 risers, all worked good from the first try, just some time needed for windows to search for the drivers
best super cheap MB for me.....