Question about computer memory

this question is not related to cd or burners but if someone knows

can you please let me know
what is the difference between
Azenram 512MB 184-Pin PC333 DDR Memory
and
Azenram 512MB 184-Pin DDR Memory

cause my computer needs 2700 does it matter if i put either one

Go here and look > http://www.crucial.com/

Short answer:
PC2700 = DDR 333
Using memory rated as PC2700 (DDR 333MHz) or faster should work.

Advice:
Do not use generic or cheap no-name brands. For lower cost, but reliable memory, I would recommend Crucial or Corsair. If you are in the U.S. - check out www.newegg.com