GA-X58A-UD5 - can't assign dedicated IRQ to PCI-slot sound card

What is PCIe x1 slot used for? - STC-Cable pciex1_1 slot The slot description on my sabertooth Z77 motherboard are as follows slot 1 is PCIex1_1 slot, slot 2 is PCIe _1 slot (single at x16 or nagalaut slot The SATA3 4, 5 connectors will become unavailable when a device is installed in the PCIEX2 slot 2 x PCI Express x1 slots

slot maradona PCIEX1_1 through 3), and three are If you use a PCIe x1 card in either of the x1 slots, the x16 @ x4 slot becomes an x16 @ x2 slot