AnandTech had a quick look at the OCZ RevoDrive x2 PCIe SSD, you can check it out over here.
The performance is pretty impressive, the storage device delivers sequential read speeds as high as 801.5MB/s and random 4KB write performance as high as 515.8MB/s.
Identical to the original RevoDrive in every way, the x2 adds a second PCB complete with two more SF-1200 controllers. With a total of four SF-1200s on board, running in RAID-0, you should get IBIS-like performance without the HSDL interface.
The architecture remains unchanged. To save on costs OCZ uses a PCI-X based RAID controller: the Silicon Image 3124. The 3124 has four independent SATA ports, each one connects to a SF-1200 controller.