Prelude, for the MSI Z77 MPower, did you have to short any of the pins in the PCI-e slots to get all 7 GPUs to work/be recognized?
I'm looking for the same answer...
I'm runing 3 X GTX 750ti directly from the PCIex16, but I have no luck so far with the PCIeX16 to X1 riser (USB version/powered)...
I have two extra cards sitting there...QQ