Gigabyte GA-990FXA-UD5 Manual - Page 10
Product Specifications, All PCI Express slots conform to PCI Express 2.0 standard. - socket am3
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1-2 Product Specifications CPU AM3+ Socket: - AMD AM3+ FX processors - AMD AM3 Phenom™ II processors/AMD Athlon™ II processors (Go to GIGABYTE's website for the latest CPU support list.) Hyper Transport Bus 5200 MT/s Chipset North Bridge: AMD 990FX South Bridge: AMD SB950 Memory 4 x 1.5V DDR3 DIMM sockets supporting up to 32 GB of system memory * Due to Windows 32-bit operating system limitation, when more than 4 GB of physical memory is installed, the actual memory size displayed will be less than 4 GB. Dual channel memory architecture Support for DDR3 2000 (O.C.)/1866/1600/1333/1066 MHz memory modules * To support a DDR3 1866 MHz (and above) memory, you must install an AM3+ CPU first. (Go to GIGABYTE's website for the latest supported memory speeds and memory modules.) Audio Realtek ALC889 codec High Definition Audio 2/4/5.1/7.1-channel Support for Dolby® Home Theater Support for S/PDIF Out LAN 1 x Realtek RTL8111E chip (10/100/1000 Mbit) Expansion Slots 2 x PCI Express x16 slots, running at x16 (PCIEX16_1, PCIEX16_2) * For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16_1 slot; if you are installing two PCI Express graphics cards, it is recommended that you install them in the PCIEX16_1 and PCIEX16_2 slots. 1 x PCI Express x16 slot, running at x8 (PCIEX8) * The PCIEX8 slot shares bandwidth with the PCIEX16_2 slot. When PCIEX8 is populated with a PCI Express expansion card, the PCIEX16_2 slot will operate at up to x8 mode. 2 x PCI Express x16 slots, running at x4 (PCIEX4_1, PCIEX4_2) 1 x PCI Express x1 slot (All PCI Express slots conform to PCI Express 2.0 standard.) 1 x PCI slot Multi-Graphics Technology Support for 2-Way/3-Way AMD CrossFireX™ technology Hardware Installation - 10 -