[citation][nom]razor512[/nom]Most SSD's today can hit 700MB/s or faster if they were not limited by the sata port.The reason why you see the speeds of most SSD's topping out at 550-560MB/s is the sata port bottlenecking.If you get rid of the sata interface and replace it with a direct pci-e interface, you will get faster speeds. In the case of pci-e x2, you get 1000MB/s which will effectively be lower when you consider the management overhead just like with sata III offering 600MB/s but in the real world, you get about 550MB/s[/citation]
PCIe 2.0 x2 (although x2 is kinda weird for PCIe and PCIe 3.0 x1 or PCIe 1.0 x4 would be used much more often) can get you very close to 1GB/s and SATA3's failure to reach 600MB/s isn't because of any "management" for it, at least not directly. We could make a set of SATA 6Gb/s hardware/software that can reach effectively 600MB/s (not that 550MB/s isn't already pretty close, it is, after all, less than 10% lower) if we wanted to.