Pasting a comment I added in the TripleHead2go thread
http://www.dual-boxing.com/forums2/viewtopic.php?t=662

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Please be aware that the Matrox team ain't the fastest at updating its DualHead2go - TripleHead2go "drivers" to keep up with ATI chips.

I just found out that their lastest version of PowerDesk app, in charge of listing all different resolution available to your card, isn't capable of detecting the new X3850 and X3870 chips.

As a result, it considers them as sub-X2000s and limits the max res to 2880 * 900.

While the X2000s get to 3800 * 1200, even the slowish X2400.

This has been confirmed over the phone with their HQ tech support in Montreal a few hours ago.

No deadline available for the patch, the folks actually opened a ticket to the Dev team.
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/salute