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Dell released BIOS revision A09 for the Alienware M17x R3. Under "fixes and enhancements" it says So it seems they have done something similar to the BIOS as with the most recent M14x BIOS, this might result in lower SSD speeds. It has been said that Dell changed the BIOS so that it really applies to the SATA 3 specifications, with the result that some SSDs don't completely adhere to these specs might now run at SATA II speeds. Firmware updates of the SSD vendors might fix this. SSD manufacturers will probably say that the controller on the motherboard is the issue and not the SSD itself... I have no idea what is actually true, fact is that the SATA 3 didn't get removed, it still works with some drives. Anyway, I recommend everyone to use this BIOS since the SATA "enhancement" or whatever you want to call this is certainly not the single change in there. Dell always fixes a lot of other small bugs and improves the BIOS, expect this to be true for this revision as well. Download link: M17x R3 BIOS A09