My index has dropped from 7.7 to 7.1 without any hardware or software changes. This happened because my harddrive (OCZ Vertex 2) score dropped by the same amount.
I have a P67 motherboard (the original one with the bug), and I'm still using the SATA-3Gbs port.
Makes me wonder if it's the bug that I'm seeing already, or if its something else entirely?
As it is I don't really care much. I can always just switch to one of my 4 SATA-6Gbs ports, I just haven't gotten around to doing it yet (couldn't be bothered since Intel said it was only a 5-10% chance, and not likely to happen for the first couple of years).