What is the multiplier if your front side bus is 133 MHz and your processor runs as 2.53 GHz?

Im guessing your multiplier would be around 19x or so, you could check this by entering your BiOS at startup and checking in there.

Ususally to enter the BiOS you hit one of the following:

-Esc

-F2

-F10

-F12

-Delete

One of these usually enters the setup.