Go to google and search for "Celeron and Pentium"
Read the results. There are some interesting items
here.
Also go here and search for same:
http://komando.master.com/texis/master/search/?s=SS&q=
You are smart to ask and research this before buying.
Q. Can you tell me the difference between a Pentium
processor and a Celeron processor?
A. Both microprocessors are made by Intel. Pentium IV is
the premium product. Currently, its highest speed is 3.06
gigahertz. Celeron is used in budget machines; it has a
Pentium IV core and runs as high as 2.2 GHz. The other
difference is in secondary (L2) memory cache. Pentium has
512 kilobytes; Celeron, 128 KB. L2 cache stores commands
in an effort to predict what you will do next. So, the
machine runs faster. With four times the memory, Pentium
IV would seem more likely to run faster. But in the real
world, Celeron works well with most applications and the
Internet.