|"ECS P4VMM2 (PCB:7.1/7.3)"|
OK, that's what I needed to know.
Unplug the power cord & open the case. Look for jumpers labeled JP1A1 & JP1B1...they're roughly in the center of the board, just above the AGP slot. To change to 533MHz FSB, move the jumper caps to the following pins:
JP1A1 = pins 2-3
JP1B1 = pins 1-2
Close up the case & boot up.