I have one of the first produced macbooks. Model Name: MacBook Model Identifier: MacBook1,1 Processor Name: Intel Core Duo Processor Speed: 1.83 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 2 MB Memory: 512 MB Bus Speed: 667 MHz Boot ROM Version: MB11.0061.B03 SMC Version: 1.4f12 Serial Number: 4H62545YU9B Sudden Motion Sensor: State: Enabled I installed new leopard and it runs super slow. I was wondering if it is harmful to install 2x2gb owc5300 sticks. I run Reason 3.0 and its a huge task for this computer. As well as running photoshop by itself, its just too slow! Please help and let me know if it's possible. My brother purchased me these ram sticks as a gift and I want to put them to use.