#10
The Apple 256GB will always be faster than the Apple 128Gb. Because the 256GB SSD is made up of 32 independent NAND die, clustered into 8 discrete packages. Where as the 128GB is made up of 32 independent NAND die, clustered into 4 discrete packages. The number of discrete packages is relative to the speed of the SSD. I read it somewhere on AnandTech.