1
Introducing the Motherboard
Chapter 1
Introducing the Motherboard
Introduction
Thank you for choosing the A790GXM-A motherboard. This motherboard is a high
performance, enhanced function motherboard that supports socket for AMD
Phenom
TM
processor (socket AM2+)/Athlon
TM
64 X2/Athlon
TM
64/Sempron
TM
pro-
cessors for high-end business or personal desktop markets.
There is an advanced full set of I/O ports in the rear panel, including PS/2 mouse and
keyboard connectors, COM1, one VGA port, one HDMI port, one optical SPDIFO
port, six USB ports, two LAN ports and audio jacks for microphone, line-in and 6/8-
channel High Definition
Audio output.
The SB750 Southbridge supports two PCI slots which are PCI 2.3 compliant. In
addition, two PCI Express x1 slots are supported, fully compliant to the PCI Express
Gen2 (version 2.0). It integrates USB 2.0 interface, supporting up to twelve func-
tional ports (six USB ports and three USB 2.0 headers support additional six USB
ports). One onboard IDE connector supports two IDE devices in Ultra ATA 133/100/
66/33 modes.
The Southbridge integrates a Serial ATA host controller, supporting six
SATA ports with maximum transfer rate up to 3.0 Gb/s each.
The motherboard incorporates the AMD 780D Northbridge (NB) and SB750
Southbridge (SB) chipsets. The Northbridge supports the HyperTransport
TM
3.0 in-
terface. The memory controller supports DDR2 memory DIMM frequencies of
1066*
1
(AM2+)/800/667/533/400. It supports four DDR2 slots with maximum
memory size of 32 GB*
2
. Two PCI Express x16 slots, intended for Graphics Inter-
face, are fully compliant to the PCI Express Gen2 (version 2.0).
1. Whether 1066 MHz memory speed is supported depends on the CPU
being used.
2. Currently, the memory maximum size we have tested is 8 GB (2 GB per
dimm).
*
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