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Matrox G450 - Can't use 32 bit color at 1680 x 1050

6389 Views 1 Reply 1 Participant Last post by  Reesy
Matrox G450 - Can't use 32 bit color at 1680 x 1050 resolution

Hi there,

I am currently using a Matrox Millennium G450 dual head display adapter with a WSXGA (1680 x 1050) LCD monitor on Windows XP.

Using 32 bit color quality at lower resolutions such as 1280 x 768 is no problem, but when I increase to the monitor's native 1680 x 1050 resolution, I am only able to use 16 bit color. This results in icons looking all jagged as well as severe banding in my display.

If I try to change the settings to 32 bit color in Display Properties >> Settings >> Color Quality the screen resolution slider automatically drops from 1680 x 1050 down to a lower value.

I used the Matrox Tech Support Tweak Utility (MTSTU) to create the 1680 x 1050 setting as it wasn't available by default. Not sure if this has anything to do with the problem, could it be that the G450 doesn't support WSXGA with 32 bit color?

Any advice would be appreciated here.

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Turns out that the 32MB of video memory on the card wasn't enough to deliver 32 bit colour depth on 2 screens at 1680 x 1050 resolution.

However, since I'm currently only using 1 display, I was able to divert some of the juice from the secondary display by going to:

Display Properties >> Advanced >> Dual Head >> Advanced Settings >> Display Capabilities >> Change Settings

This brings up a slider which you can use to adjust the ratio of memory used between the two heads and voila! 32 bit colour depth at WSXGA resolution (on 1 display).
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