I am looking to get a mac book pro with 2gigs of ram. I am going to upgrade it to 3 D.I.Y. I have seen plenty of videos and it's real easy. Now I hear that you have to install in pairs. OWC sells a 1x2 gig for around 234, and they sell a 1x1 & 1x2 gig pair for a little over 300. What is the point of buying the pair if you have to put your notebook model and type in to find out what memory is compatable with your notebook. STOCK macbook pros come with 2x 1 gig so why would you by the 2 and the (1 gig again). maybe this is a general wrap around, or if you want new ram because your ram is damaged. Also I have found the 2x1 gig prices ranging from 240 up to 500. Still better than apples price of $575 to upgrade to 3. Does anybody know what might be the differences, durability, heat issues etc. I've heard high regards of OWC which has there own 2 gig for 234, a micron factory orig. for 327 and a samsung factory 2 gig for 439. Crucial memory has a 2 gig for 350 and welovemacs has 1 for 399.99. Why not get the cheapest at OWC. Why does OWC sell others when there prices blow 3rd parties out of the water... HELP!!! Ive heard of what is basically cardboard ram but I have no complaints about OWC, but I hear of alot of slowdown post ram upgrade install after a few weeks or months and I wonder if this could relate back to the quality of ram. Also is it critical to put the high ram (2 gig on top, I guess meanin closest to to the bottom because you flip it over) and then the 1 gig underneath?