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The RevoDrive is a single expansion card that is effectively two SSDs (each with its own controller) coupled to an onboard RAID controller (configured in RAID 0) that uses a PCI Express interface to providing blazing fast transfer rates.
The sample provided for review is a 50GB unit rated for quite impressive read speeds of up to 540MB/s and write speeds of up to 450MB/s.
Full story at Big Bruin.