Does anyone know whether the 3 choices of PCIe flash size for the nMP would differ in speed? I've been unable to find any discussion of that issue. I'm asking the above question because I've read that in the latest Retina MacBook Pro, the 1TB PCIe flash is substantially faster (at both reading and writing) than the 512GB flash. It seems the reason may be that the 1TB flash is 4-channel (whereas the smaller capacity is not). Apple apparently only advertises the slower flash speeds for the rMBP and based its testing on the 512GB model. In contrast, for the nMP, Apple's testing refers to the 1TB model. On a related point, I am wondering how performance would compare for PCIe flash of the same capacity on the rMBP and the nMP.