The 650E has a locked bus multiplier of 6.5. The only way to O/C is to up the bus speed towards 133. Most 650E's will do 865 on a 133FSB.
As I am not familiar with your mobo, if it is a BX chipset board you will have an 89MHz AGP @133MHZ so, have a good vid card in there and some PC133 RAM. Although, some PC100 of superior quality will do 133.
If your mobo has the Apollo Pro 133A chipset, you should be able to O/C that CPU on the 133FSB, with little or no difficulty, using the 1/2 AGP divider available.
