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Intel
®
X48 Express Chipset
The Intel X48 Express Chipset consists of the following devices:
• Intel X48 Express Chipset Memory Controller Hub (MCH) with Direct Media
Interface (DMI) interconnect
• Intel 82801IR I/O Controller Hub (ICH9R) with DMI interconnect
The MCH provides interfaces to the processor, memory, PCI Express bus, and the DMI
interconnect. ICH9R is a centralized controller for the board’s I/O paths.
Related Links:
Go to the following link for more information about the Intel X48 Express Chipset:
http://developer.intel.com/products/chipsets/index.htm
Audio Subsystem
The onboard audio subsystem consists of the following components:
• Intel
®
ICH9R I/O controller hub
• IDT STAC9274D audio codec
The subsystem has the following headers and connectors:
• Back panel audio connectors, including an S/PDIF optical port
• High Definition (HD) Audio front panel header that provides mic in and line out
signals for front panel audio connectors
• HD Audio Link header used for HDMI video cards
• S/PDIF connector that can be used for HDMI video cards that do not work with the
HD Audio Link header
The audio subsystem supports the following features:
• Dolby* Home Theater
• A signal-to-noise (S/N) ratio of 95 dB
• Independent multi-streaming 8-channel (7.1) audio (using the back panel audio
connectors) and 2-channel audio (using the Intel High Definition Audio front panel
header)
• ADAT optical interface support via the back panel S/PDIF optical port
Related Links:
Go to the following link or pages for more information about:
• Audio drivers and utilities http://support.intel.com/support/motherboards/desktop/
• The location of the onboard audio headers, Figure 27 on page 48
• The signal n
ames for the Intel High Definition Audio front panel header and the HD
Audio Link header, page 49
• The bac
k pa
nel audio connectors, Figure 28 on page 53