Multiple display specialist Matrox Graphics has introduced dual Graphics eXpansion Module (GXM) support to drive more monitors from a single PC. A second GXM can now be connected to the secondary output of a supported dual-monitor graphics card so two DualHead2Go GXMs can power up to four outputs in 2x2 or 4x1 modes, while two TripleHead2Go GXMs allow six displays in either a 3x2 or 6x1 setup.
A maximum of two GXMs of the same make and model can be connected to a supported graphics card. Stretched desktop mode is available with Matrox M-Series cards, while independent desktop support is available with M-Series, ATI HD 2000 and newer, ATI FireMV/GL, Nvidia 8-Series and newer, and Nvidia Quadro models. (See Matrox's compatibility page for details.)
The DualHead2Go GXM costs $169 for the Analog or $229 for a Digital or DisplayPort Edition. TripleHead2Go Digital and DP Editions are $329 each.