Hi, I have a macbook 4,1 black version so I have 2.4 GHz intel core 2 duo processor and currently 2 gigs of memory. Now my problem is do I go with the 4 gig or the 6 gig upgrade. I understand that when there are 2 sticks of ram of the equal size it always the mac to run the parallel(Im not sure what its called but essentially it works better) And so if I put 6 gigs of ram in I would have to use a 2 gig x 4 gig making it so my computer wouldn't do the parallel thing witch causes a loss in speed but would the loss in speed still be faster than 2 gig x 2 gig with the parallel running? So my basic question is 4 gig x 2 gig vs. 2 gig x 2 gig....What do you think?