Multiple ATI Radeon HD 2600 XT cards in a Mac Pro

I'm wondering if anyone has any experience with screen spanning with multiple ATI Radeon HD 2600 XT cards. What I'm looking to do is super widescreen presentations with keynote and I need more pixels. Right now I use the Matrox Dual and Triple head to go GXMs to achieve this because they make the computer see multiple monitors as one giant display but I am limited to 3840x1200 (dual 1920x1200) I was wondering if multiple video cards would also see the displays as one giant desktop?
It works on a PC but then I have to use PowerPoint (ugh). Any help or suggestions with this? Thanks in advance.

Multiple graphics cards will make the displays act as one large desktop, but when an application is set to full screen mode, it usually will just use one display. If the application is run in window mode, you should be able to move and enlarge (by dragging the lower-right corner) the window to use all displays, but there will be a window border (and menu bar on one display). You could zoom the display slightly to move the border off-screen. There is a setting in Zoom Options of "Universal Access" system preference to stop the zoomed image from moving unless the pointer reaches an edge.

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  • Updating ATI Radeon HD 2600 card.

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