TweakTown has posted a guide on how to get AGP4x to work in Windows 2000 with the VIA chipset. Here is a clip:
When Windows 2000 Professional is installed and any of the 5.xx ref drivers are used, my AGP speed is reported as 2x. With a simple registry trick (aka fix or hack) you can make Windows 2000 enable AGP 4x and get back to optimal speed in no time at all... WoooHoo!Read more