Hi guys, I am considering selling my MacBook MB403LL/A to get a MacBook Pro MB990LL/A but I am not sure if it is worth it as they are the same price and I don't understand the technical differences. Can you please help me understand? You can be very technical, I'm an engineer. Reasons I need an upgrade: - Running recording music recording software which is heavy on RAM and CPU - Need a powerful machine that will last a LONG time as I will be going back to Grad school Differences between the MacBook and the MacBook Pro: 2.4 GHz Intel Core 2 Duo processor with 3 MB shared L2 Cache 2 GB 667 MHz DDR2 SDRAM; 800 MHz data bus speed Intel GMA X3100 Graphics Processor 2.26 GHz Core 2 Duo Processor with 3 MB shared L2 Cache 2 GB of 1066MHz DDR3 RAM DDR3 memory (up to 8GB) 1066MHz frontside bus NVIDIA GeForce 9400M integrated graphics Thanks!!