I bought some PCIe x1 extension cables off of ebay for a few bucks each.
They came only ready to accept x1 sized cards.
I drilled out one side of the extension cables to allow for a x4, x8 or x16 sized card be fit inside of them.
When I connect the x16 GPUs to my motherboard via the PCIe x1 cables, they are not recognized.
I am told I might have to "bridge" the PCIe extension cable, like so:
Is this all I need to do? Don't want to short my GPUs or my motherboard or anything! I only have one :S