did you update 3dmark2000? the AGP thing in your bios is the aperture size. setting it below 32mb
makes it a pci card. there's also a viaagp reg for w2k to make enable it to 4x use pcilist/cpuid to check if enabled or not. disable byte merge, all shadowing, set AGP strength to auto and set AGP mode to 4x. my old d650@900 with gtsmx does 4200 in w2k.