1 x PCI Express x16 slot, running at x16 (PCIEX16)
* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.
2 x PCI Express x16 slots, running at x4 (PCIEX4_1/PCIEX4_2)
3 x PCI Express x1 slots
(All of the PCI Express slots conform to PCI Express 3.0 standard.)