128 gb slower?
to OP: the reason 128GB drives tend to be a lot slower is that there are less nand die on the pcb of the drive, so less channels of the controller are filled. If a drive series is using an 8 channel controller and only has 4 nand packages on it, then only 4 channels of that controller are saturated and the write speed takes a huge hit. You might want to look into the 128GB 840 evo because samsung actually addressed this issue with a technology that they call 'turbo write' that drastically increases write speeds on smaller drives.
(also note that the 8 channel controller/4 nand packages thing was just an example, I don't know the number of channels on the 840 pro series controller off the top of my head, or the number of nand packages on the 128GB drive)
Edit: did some digging, the controller in the 840 pro series is samsung's 4th gen ssd controller dubbed MDX. It has 3 ARM cortex R4 cores at 300MHz and supports 8 channels for nand. The drive also has 4x32GB nand packages
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