the Asus P4B266 can lock AGP and PCI using the chipset "turbo" settings. These settings do not set it to the default 33/66 though, its slightly higher, and ive found that sound blaster lives act erratic with the turbo1 and turbo2 settings in the bios. If you can find a soundcard that doesnt have a problem with a slight pci overclock, itll work great. I use a sound blaster live extigy and it handles great with all settings as its external and works through the usb controller, which doesnt seem to fail at any fsb.