Magnum...I would go and buy a GFD to overclock..they are very easy to install...the GFD(Golden Finger Device) allows you to overclock your classic athlon by upping the multiplier..yours rite now is set to 8 X 100..hence the clockspeed of 800...if you want to go higher you have to up the multiplier..the GFD has some dip switches on them that allow you to up the multiplier and also to increase the voltage..you will more than likely have to increase the voltage the higher you overclock....to install a GFD you will have to remove the plastic case surrounding the PCB..its no big deal to remove it and actually removing it will bring your core temps down a bit...
You can also overclock via the FSB(front side buss) which can be done via the mobo's bios...BUT... when you overclock this way your are basically overclocking your whole system..vid card, memory, sound...everything because your are increasing the FSB for the entire mobo...so it effects all components..and maybe some of your components won't like that..so you should increase the FSB very slowly....
If I were you I would go and get me a GFD and overclock that way and make sure you have good cooling for your CPU...
good luck..and you can email me if you need any help..
PS..goto this thread..this guy has a GFD for sale:
GFD 4 Sale