Dual/Triple head to Go boxes have worked fully with catalyst since their first introduction in around 2006 - on machines then - you could use 2 at the same time at certain resolutions on certain graphics cards-

what you can or cannot use together - or what is supported by the graphics card - whether it works is not dependant on catalyst -

it changes with every single iteration of graphics card mac update or operating system-
in the last year the move to display port adaptors caused a number of reported problems with older analog and digital triple heads-
i dont know the status of this -
i havent used the display port triple heads myself-

there is a performance cost to running such large displays on triple heads - but usually its not too great-
but it is a moving target-
and whether one or 2 can be used at the same time is beyond my control

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As of now matrox now has 6 different versions available-

so the possible combinations of these things working or not working is huge- in one or more combination-

Matrox has also recently updated their software-

Connect two Matrox DualHead2Go or TripleHead2Go units directly into your system to achieve a four- or six-monitor workspace

ISE 2010, Montreal, Canada, January 27, 2010—Matrox Graphics Inc., the leading manufacturer of specialized graphics solutions, today announced multiple DualHead2Go and TripleHead2Go Graphics eXpansion Module (GXM) support to drive up to four or six monitors, respectively, from a single system. 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 units can be combined to connect six displays to produce either a 3x2 or 6x1 set up.
http://www.matrox.com/graphics/en/products/gxm/
http://www.matrox.com/graphics/en/press/guides/th2go/
http://www.matrox.com/graphics/media...ineup_intl.pdf

http://www.matrox.com/graphics/en/pr...multiple_gxms/

Even i am confused by this- there is no mention of mac/pc requirements of compatility- on these pages - and whether information is PC only.

but there is a mention of compatibility on this page:

http://www.matrox.com/graphics/en/su...s/#mac_desktop



Quote Originally Posted by downie View Post
Question - is it possible to run two analogue Dual Head 2 Gos with a NVIDIA GeFore GT120 card?

I am trying to drive three projectors and have one monitor for control.

If the answer is no I can stop trying and explore another option - maybe a triple head?

Any help much appreciated.

Andy