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User’s Manual
ESM-2850 User’s Manual
15
The GMCH contains one 16-lane (x16) PCI Express port intended for an external PCI
Express Based graphics card. The PCI Express port is fully compliant to the PCI Express
Base Specification revision 1.0a. The x16 port operates at a data rate of 2.5 GB/s while
employing 8b/10b encoding. This allows a maximum theoretical bandwidth of 40 GB/s each
direction. Intel 915GM/ PM may also be configured as PCI Express x1 port.
The GMCH is capable of driving a CRT, LCD panel, Analog TV and/or two SDVO devices
(SDVO ports are mixed with PCI Express). The display is the defining portion of a graphics
controller. The display converts a set of source images or surfaces, combines them and
sends them out at the proper timing to an output interface connected to a display device.
Along the way, the data can be converted from one format to another, stretched or shrunk,
and color corrected or gamma converted.
The GMCH supports two SDVO ports multiplexed with PCI Express Graphics interface.
The SDVO ports are capable of driving a variety of external TV-Out, TMDS, and LVDS
transmitter devices. SDVO devices are capable of driving a standard progressive scan
analog monitor with resolutions up to 2048x1536 at 75 Hz. This interface may be
configured for as PCI Express x1 port also.
DMI is a point -to- point connection from the GMCH to the ICH6-M.