The top pcie slot 16x is taken up by a gpu and the bottom 4x is also taken up by another gpu. The only pcie slot available is the 1x one at the top above all my cards. My bottom card is a 3 slot GPU and takes up ALL my room at the bottom so unfortunaly that slot is out of the picture.
Sorry about your luck!
Maybe buy a better board next time that actually has real crossfire x8x8.
If you want to use 2x gpu.
I'd move the 3 slot gpu into the main pcie x16slot then.
Open the bottom pci for soundcard.