I'm glad that you found the fault at last. If you have "4A" among your G400's serial number that it should work on AGP 4X, otherwise Matrox doesn't garantee your G400 work fine under AGP4x. In my opinion, people who buy G400 should like its image quality and excellent 2D performance if using G400 in 3D gaming, it should also be capable of this. So does it really matter to you G400 works under AGP 4X ?? If you are a benchmark chaser, I suggest you to have a fast CPU because a fast CPU would bring better benchmarks than VGA adapters do. Do you agree with me ?

In your situation, I've reinstalled my NT today, and my G400 can perform well both English and Chinese drivers without modifying system. Maybe you should uninstall your driver in VGA mode then reinstall driver again ( Maybe this time you should try WHQL version 4.21 )after reboot. Thus you can get a "full" driver. Try try try , no pain, no gains !!

Sorry to write so lousy, hope it helps.

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MURC