I started a thread in an effort to get advice on whether to upgrade or replace my Macbook Pro here: http://forums.macrumors.com/showthread.php?t=1472927 I have a late 2008 Unibody Macbook Pro 2.4Ghz Core 2 Duo 15.4 Mac OSX 10.5.8 Leopard. I have decided to increase the memory from 2GB to 8GB however memory selection tools such as those found on crucial only offer 4GB upgrades. Kinston does not list a late 2008 model only a mid 2009 model and offers 4GB and 8GB here: http://www.ec.kingston.com/ecom/configurator_new/modelsinfo.asp?SysID=56219&mfr=Apple&model=MacBook+Pro+%28DDR3%29+15&search_type=&root=uk&LinkBack=&Sys=56219-Apple-MacBook+Pro+%28DDR3%29+15-inch+%28Aluminum+Mid+2009%29&distributor=0&submit1=Search I understand from research that by default this model will only accept 4GB max however I have been advised that if I upgrade to Lion and update my (EFI whatever that is) this Macbook will make use of 8GB. Can someone offer advice on what memory to buy speed / brand etc. Same detail for Hard Drives which brand, I have been advised to stick with a 3.5 SATA but what data speed 1.5GB or 3GB, what RPM and what brand? Many thanks.