its K7s
Either way since its a model 6(Palomino core. looks like a AthlonXP 2200+) they run very hot and you will have to check the temps before overclocking. A new heatsink is a MUST
on the plus side the cpu is old enough(or at least it appears to be) to change the multiplier with little wires(you get them from an old power or data cable with small strands of wire.) in the socket.
When i say small wires, i mean it
Now go to OCinside's website and you can select your cpu parameters. then what you want(don't get too pushy). If you open them in different windows or tabs it is easier to do(you do not need to add the wires that your cpu already has connected, just he extras). Now add the small wires(short, in a u shape) then reinsert the cpu and reinstall the heatsink. Cross your fingers and power up(make sure the wires are in the right spaces).
The pin mod can also adjust the voltage up, but that will add heat and that cpu is most likely already at 1.8volts.
the 133 is 266 so don't change it. just up the multi, and if brave a bit of voltage.
http://www.ocinside.de/go_e.html?http://www.ocinside.de/html/workshop/pinmod/amd_pinmod.html
Those cpus's are not known for overclocking, but if you want to try thats the best way. You can also increase the fsb in the bios.