i would say the sata bandwidth limit is taken into consideration when the controller chips are designed. Sandforce/Marvell/etc are not going to design a chip that will exceed Sata 3 bandwidth...
Well that's obvious. Why would they do that? This is becoming a market where performance doesn't crawl up incrementally (like processors or gpus), rather skyrockets with each new generation. Pci-e solutions like revodrive overcome the SATA 3 bandwidth limitations, but not everyone has a pci-e x4 slot to spare (not me, for one). For most people, it just makes more sense to use a SATA port for a hard disk replacement rather than PCI-E.
The SATA 3 interface (which is currently less than 3 years old) will actually become the bottleneck to further performance by the next generation (gen 4) of ssds.
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