I'm currently rocking an old 13-inch, Aluminum, Late 2008 Macbook. Processor 2.4 GHz Intel Core 2 Duo Memory 2 GB 1067 MHz DDR3 Graphics NVIDIA GeForce 9400M 256 MB Software OS X 10.8.2 (12C60) Since upgrading to OS X Lion and Mountain Lion, my laptop is running a bit sluggish and I would like to upgrade the RAM. Where can I go for reliable economically priced RAM and can someone please provide me with a direct link? Reading the apple support website, it looks like I can get 2 x 2GB = 4GB memory total. 2 SO-DIMMs of 1066 MHz DDR3 SDRAM (PC3-8500). However when I click on "About this Mac" and "memory" I'm told: "Your Mac contains 2 memory slots, each of which accepts a 1067 MHz DDR3 memory module." So i'm just confused, do I need 1067 MHz or 1066 MHz RAM and where should I go to get it?? Thank you for clearing this up.