Matrox Graphics eXpansion Modules
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Matrox Graphics eXpansion Module (GXM) supports the use of multiple monitors over a single video source by splitting the output of a video source, providing an enlarged workspace or gaming environment. GXM is not a graphic card itself, and in fact requires a fairly powerful graphic card for playing games on multiple monitors (Surround Gaming).
While most modern graphic cards have support for dual monitors and can expand a desktop across three screens, 3D games are generally limited to a single monitor. The GXM uses the standard EDID (Extended Display Identification Data) structure to communicate its capabilities to the graphics card just as a monitor does, however the GXM's resolutions include all the pixels in the three monitors. If the TripleHead2Go were hooked up to three monitors with 800x600 resolution, the TripleHead2Go would report itself as a single monitor with 2400x600 resolution. The graphic card then sends out a 2400x600 signal which the TripleHead2Go divides and distributes to the appropriate monitors.
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[edit] TripleHead2Go
The TripleHead2Go supports 3 displays at the output, has maximum resolution of 3840x1024@60Hz (1280x1024 each). The low 60Hz refresh rate is used in all except 3072x768 resolution which makes it unsuitable for CRT monitors (however, the severities of flicker perceived by viewers depend on other factors). There are both analog VGA and digital signal DVI versions available.
[edit] DualHead2Go
It is similar to TripleHead2Go, except it supports only 2 displays. When setting output to 1024x768 per display, the refresh rate can be set up to 85Hz. It has maximum resolution of 2560x1024@60Hz (1280x1024 each). It was later renamed to DualHead2Go Analog Edition.
[edit] DualHead2Go Digital Edition
Compared to original DualHead2Go, this one supports DVI-I output by converting input signal to digital, but it still supports analog output. It has maximum resolution of 3840x1200@60Hz (1920x1200 each). However, only NVIDIA's video cards can support 3840x1200 at all modes and colour depths.
Despite the name suggested, it cannot use digital video source.
[edit] Gaming
At this writing (2006) the Matrox TripleHead2Go is the only consumer level device which allows 3D gaming across three monitors with an expanded field of view (FOV). Very few games directly support playing at these large resolutions, however many can be tweaked to run on the TripleHead2Go. Matrox maintains a compatibility list of games and provides a Surround Gaming Utility to automatically adjust the game settings to run on three monitors. Some problems remain with distortions to the user interface and geometric distortions at the edges of the display since the games weren't written with such a wide FOV in mind.
