Ok, so I'm thinking I'm gonna buy some RAM. The brand is corsair, all the specs are the same but one stick says CAS 2.5, and the other says CAS 3.0. I'm guessing from the price of it, the CAS 2.5 is better. But from oly 6 bucks difference, is the CAS 2.5 compared CAS 3.0 worth the extra 6 buckos?!?