Help I have a really old Packad Bell. a PII 300Mhz and i want to know if I can overclock it to get more out of it, as my parents wont buy me a new PC

and I'm still only a student with no money :'( I know I have a Mediabooster mobo and i have installed a 3d Prophet 4000XT and 128MB SDRAM but I still get lousy framerates in CS ever since I got a cable connection. What can I do?