Matrox PowerDesk-HF

Before attempting to use a multi-display feature, make sure all your display devices are properly connected to your Matrox hardware. Matrox PowerDesk software may not detect whether a device is properly connected and a feature may be enabled regardless. For more information, see the hardware guide included with your Matrox product.
While using more than one display at a time in independent mode, Windows only allows 3D OpenGL acceleration with your primary display.
To enable or disable independent mode, your computer must be restarted.
For displays used in stretched mode:

Your displays use the Screen area (Windows 2000) or Screen resolution (Windows XP) slider to select the resolution of all the displays together. Specifically, the width you select is the total width for all the displays and the height is for each display. For example, if you select a 2048 x 768 resolution for 2 displays, each display will use a 1024 x 768 resolution.
While using 3 displays at a time with your Matrox graphics hardware, the maximum resolution available for each display is 1280 x 1024 (that is, 3840 x 1024 for all 3 displays).
Your displays always form a horizontal rectangular area of your Windows desktop. If you move your mouse pointer off the right edge of your first display, for example, it appears at the left edge of your second display.
To properly use 3 monitors at a time with full-screen 3D programs (that is, Surround Gaming), you may need to configure settings for that program. For more information, see the documentation for that program.
When you maximize a window, it may maximize across all displays (as if all displays were one display). (You can override this with Matrox PowerDesk controls.)
Newly opened windows, dialog boxes, or message boxes may open centered "between" displays (that is, overlapping the opposite edges of your displays). (You can override this with Matrox PowerDesk controls.)

An 8-bit color palette for your display may be unavailable with multi-display features. As a result, you may not be able to use some older programs that require an 8-bit color palette. In any event, we recommend you use the highest color palette setting available (a 32-bit color palette).
Matrox Parhelia -- If you're using two digital monitors at the same time, your Matrox hardware uses the same display resolution for both your monitors. If you select different resolutions for your displays, one of your displays may use only a portion of the screen (the rest of the screen will be black). To avoid having only a portion of the screen used, we recommend you select the highest display resolution available. The highest display resolution available is the highest resolution supported by both monitors. If one of your monitors supports a higher resolution, it may use display scaling to fill the entire screen. For more information on what your monitors support, see their documentation.