I currently have a white MacBook 4,1. It's the model released in early 2008, with a Core 2 Duo (Penryn) 2.4 GHz processor, 2 GB RAM and a 160 GB HD. I am thinking of upgrading it to give it some new life. So I intend to put more memory (4 GB) and a 128 GB SSD (instead of the slow 5,400 RPM HD). I have two questions: 1. The MacBook has two memory slots. Each one is filled with 1 GB DDR2 at 667 MHz. I would like to put 2 GB in each slot. According to Apple, I should use two similar memory modules. Would it be possible to put 800 MHz modules, since the MacBook has a FSB of 800 MHz? 2. Although Apple recommends not to swith the HD in the white MacBook, I've seen many people doing that. Is there something I must be aware of in switching the HD for an SSD?