Athlon 2400+ and Gigabyte Triton series mobo: Overclock?

I recently purchased a Gigabyte K7 Triton series mobo, model GA-7n400-L to
be specific, and an AMD 2400+ CPU, the 266 MHz FSB version.

I'm thinking about overclocking the CPU. I can't do this thru the BIOS (the
BIOS for this board sucks when it comes to overclocking...). There are dip
switches on the board. Currently, they are set to Auto for the FSB and the
CPU, it will automatically set the FSB speed and the multiplier.

I'd rather not overclocking by adjusting the FSB. Some games I play start
getting jerky when I do that (namely UT2003). However, I'm hoping to adjust
the clock multiplier by setting the switches accordingly and bump up the
speed a bit. Question: is it possible to do with this CPU or is it
"locked"? Also, with regular cooling (CPU fan, 2 fans sucking air out of
the case, 2 blowing air in), how much can I realistically expect to
overclock. If I can only bump it up to 2500+ plus level, then it quite
frankly isn't worth it to me. HOwever, if I can get a bit more...

Thanks for any thoughts and cya!!

Chris Smith