I called Asus, they had me remove the jumper on VIO1. Now it works just fine at 1333MHz.
System won't run at 1.33GHz. It will run at 1GHz.
Specs:
1333MHz Athlon
Asus A7M266 mobo (has latest bios) (onboard sound)
256megPC2100 Crucial (1x256)
350watt ps
40gig ATA100 WD
2x HP DVD
8x Sony CDRW
Voodoo5 5500 AGP
Asound PCI NIC
Win98SE
I've tried jumper mode and jumper free mode.