Quote Originally Posted by RuedigerH
The machine is on the road and will return to Arcus-warehouse tomorrow.
I will then sent/check the profile.

I got the same issues like Fons with a G5 Dual 2GHz with ATI X800XT and OS 10.4.8.

Ruediger
thats a really old g5.

if it works it works - if it doesnt it doesnt.

depends on the maximum resolution that the x800 will support - you have to start at lowest resolutions - try 640x480 times 2 which is 1280x480 or 1920x480.
you must not expect these devices to work at high-resolution of 1024x768x3. or even 800x600x3

x800 might only support up to 2048x1536 - and thats the maximum. triple head or no triple head.
the specs and the limits are real.
Mobility™ Radeon® X800 Series supports the latest high resolution and wide-screen notebook displays with a flexible and easy-to-use interface for multiple display settings. ATI’s new LCD Enhancement Engine (LCD-EE™) allows for support of the latest high resolution and wide-screen notebook displays such as WXGA (1920x1200) and QXGA (2048x1536).
you are dealing with real hardware and software limits.
Many older graphics cards only every worked - even at their maximum up to 1920x1200 - and even that was really pushing it. it really was.
the matrox triple and dual head - pushes things well over these limits.

you have to test every single combination you intend using.
and if you try to work at this resolution on two screens -?