I have a Asus v3400 AGP (http://www.asus.com/products/addon/vga/Agpv3400tnt/index.html) and a Houston Tech M570 (http://www.houstontechnology.com/M570.htm). I have tried literally everything to get this card to use AGP but it acts only as a PCI. If anyone knows of a way to make this work or any programs to diagonose the problem, it would be GREATLY appreciated. btw, I have the newest system BIOS and newest v3400 bios and 128 megs of ram.
Mabye I wasn't specific enough in my problem. I am running windows98SE. I have installed the SiS5591 GART drivers. PowerStrip informs me that I can use DMA in my AGP support. But, the CPU-to-PCI/AGP Bridge and the VGA AGP Adaptor both do not have AGP enabled.