I am a Mac user in Norway looking to upgrade my RAM. I have a Macbook pro 2.16 intel core 2 duo with 2GB 667mhz ddr2 sdram. Max usage is 3GB so what is the best RAM option for best effecency? How does Corsair MAC Memory PC5300 DDR2 4GB KIT, SO-DIMM 200pin , CL4, 667mhz, 2GB+2GB rank compared to other recamended brands like Crucial? Does the RAM have to say MAC Memory or will any PC5300 DDR2 SO-DIMM 200pin 667mhz do? What`s best buffered or non buffered?