I decided to open up a late 2007 MacBook, also known as the 'Santa Rosa' model to replace the 10-year-old thermal paste. Once I got past removing the heat sink, I was greeted by the CPU itself, as well as another integrated circuit which as of right now, I still have not identified. The chip closer to the screen is the CPU. I tried doing a few Internet searches to find out what the other one is – no findings. Here is a close-up of the IC. I have identified the model number as LE826T965, but couldn't find anything online about it. If anyone has any ideas or knows what this chip does it would be great to hear.