Overclocking Celeron 300

I just got hold of an old celery 300, and a BX motherboard, I put some PC133 generic SDRAM in it too. I remember back in the day that the celery 300 was supposed to be "the king of overclocking" and that it was easy to get it to 450mhz. Problem is when I increased the bus speed from 66 to 100 it failed to boot. Will it run at 100 or do I have to do it from the multiplier?

 

Upped the core voltage?

 

is it a celeron 300 or 300a??

if its the latter it should overclock extremly well....

 

How do I find out if it's a 300 or 300a?

 

look at the core...