[dmachine]

I have the 1.67ghz PB and my buddy has the 1.33 PB and I have a stick of 512MB RAM. His says that it takes 2700 and mine takes 4200, would it be possible for the 4200 RAM to work in his PB?

[deus_ex_machina]

It should work in theory but the 4200 won't run faster than 2700, just equal. I've been told if you have two different modules (and they play well with together) put the faster RAM in slot 1 to avoid a bottleneck.