crucial is cheap, go to crucials own site and a 256mb pc133 cas3 stick is $109 with free 2 day fedex. a 128mb pc133 stick "rev3" (thats total BS too) is $140. YOu be the judge if that extra CAS rating is worth it. ALso a 128mb cas2 pc133 at crucial is $80 . Hmm $60 more for that mushkin "smaller company" quality. Personally i just got 2 128mb pc133 cas2s crucials off the forsale forum and they cost me $105 shipped. Awesome ram. I cant really o/c it, but i've heard it can do 140 cas2 or so, not quite as high as rev3 , but you can buy twice as much ram, so you be the judge.