OCZ confirmed that the Indilinx controllers you find in the Octane/Petrol as well as the latest Vertex 4 are Marvell silicon based controllers clocked higher and with an Indilinx firmware.
Quote: ''I received a tip yesterday with proof that OCZ's Everest controller was actually a Marvell 88SS9174 controller (the same controller used in Crucial's m4, Intel's SSD 510, etc...) with a custom Indilinx firmware. After a bit of digging, it turns out that this is indeed the case (OCZ confirmed it to me earlier today). Although OCZ is working on non-Marvell based solutions, the Everest 1 (Octane) and indeed the Everest 2 (Vertex 4) are both based on Marvell hardware. The firmware is entirely Indilinx's own development, but the hardware is from Marvell. The hardware implementation isn't completely identical as OCZ claims its solutions run at higher clock speeds than the standard off-the-shelf Marvell components.

This doesn't really change anything but it does explain how OCZ was able to bring two revisions of Everest to market as quickly as it did after the Indilinx acquisition. OCZ and Marvell have been working very closely together for a while now and even announced a native PCIe controller they collaborated on at CES this year called Kilimanjaro. As even Intel has admitted to in the past, the value in delivering an SSD isn't always in controller hardware but rather the firmware and validation.''


Source: Anandtech