The graphics cards take up the PCIe slots and the slots under them. On your board counting from the top you have PCIe x1 which can take the sound card
PCIe x 16 GPU1 blocking the battery which takes one slot space.
PCI slot that will be free
PCIe x 16 slot GPU2 (blocking another PCI slot under it)
PCI slot blocked (see above)
PCIe x1 slot alternative for the sound card.