Manual
Page 7
... Marvell® 88SE9172 R_USB30 USB_LAN CPU_FAN Socket AM3+ PWR_FAN ATX AUDIO PCIEX1_1 (Note) AMD 990FX Realtek® GbE LAN PCIEX16_1 PCIEX1_2 GA-990FXA-UD3 R5 PCIEX4_1 CODEC PCIEX16_2 DDR3_4 DDR3_2 DDR3_3 DDR3_1 AMD SB950 SYS_FAN1 BAT SATA3 45 23 01 PCI VIA® VL805 PCIEX4_2 F_AUDIO SYS_FAN2 COMA ...F_USB3 M_BIOS iTE® Super I/O F_USB2 F_USB1 B_BIOS F_USB30 CLR_CMOS TPM F_PANEL SPDIF_O (Note) Due to a hardware limitation, the PCIEX1_1 slot can only accommodate a shorter PCI Express x1 expansion card.
... Marvell® 88SE9172 R_USB30 USB_LAN CPU_FAN Socket AM3+ PWR_FAN ATX AUDIO PCIEX1_1 (Note) AMD 990FX Realtek® GbE LAN PCIEX16_1 PCIEX1_2 GA-990FXA-UD3 R5 PCIEX4_1 CODEC PCIEX16_2 DDR3_4 DDR3_2 DDR3_3 DDR3_1 AMD SB950 SYS_FAN1 BAT SATA3 45 23 01 PCI VIA® VL805 PCIEX4_2 F_AUDIO SYS_FAN2 COMA ...F_USB3 M_BIOS iTE® Super I/O F_USB2 F_USB1 B_BIOS F_USB30 CLR_CMOS TPM F_PANEL SPDIF_O (Note) Due to a hardware limitation, the PCIEX1_1 slot can only accommodate a shorter PCI Express x1 expansion card.