M329+FX4000 quadro problem

[gillekes]

the DHTG might need to see a monitor connected to its output before it turns itself on-
the microtiles might not be providing correct EDID information - to engage DHTG
suggest you use a DVI parrot or similar to spoof the monitor EDID

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i dont believe DHTG are limited to 2560 - depends on how you connect to it-
this might be a mini display port bandwidth limit - not the DHTG

The DHTG digital edition gets its signal in VGA. They are connected with minidp to VGA adapter from Apple. I think the ATI does not go beyond 2560 on analog video.
The DHTG digital edition works fine with micro tiles.
I might have to look in the DVI Parrot to see if I get this working with the DP edition.

[samsc]

The DHTG digital edition gets its signal in VGA. They are connected with minidp to VGA adapter from Apple. I think the ATI does not go beyond 2560 on analog video.
The DHTG digital edition works fine with micro tiles.
I might have to look in the DVI Parrot to see if I get this working with the DP edition.

no - true analogue vga video works at higher resolutions than mini dp.
the limit is on minidp - possibly apples version of its convertor

http://en.wikipedia.org/wiki/Mini_DisplayPort
http://forums.macrumors.com/showthread.php?t=634592

there are multiple complications with single and dual link dvi as well