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'PCIe' is the type of connection that the drive has to the rest of the computer. The type of connection used affects the speed at which data can be read/written to the drive. PCIe will typically be quicker at reads/writes that the same drive connected by a SATA connection or USB for example.
'flash based' means it's a Solid State Drive, not a spinning disk. The internal SSD's that come with a new Mac are about as fast as they come.Have fun deciding!
Where does the "PCIe flash based" drive in the mbp sit in the hdd/fusion/ssd rainbow?
I'll definitely be waiting, it'll be Oct at the very earliest before I've cleared enough of the wedding/honeymoon stuff off the credit card.