for what it's worth,... I adopt the 2 year approach now I'm older and somewhat wiser, as in, New emerging technology is embargoed for two years in my house until it matures.........I've only just gone over to SSD in the last couple of months and am enjoying reasonable integration at prices probably a quarter of what I would have paid 2 years ago.
When IDE was replaced with SATA , I like many rushed out and paid the premium for a new Sata drive only to be gutted when I found it performed no better or worse then the drive it replaced.........even pulling it apart showed me, bar the sata connector and a few new tracks on the PCB it was the exact same as the comparison IDE drive sitting next to it.........the manufacture date on the IDE body was infact 9 months newer then My new SATA drive........The boards SATA connectors were designed for greater band-width, the data cable was designed for greater band-width....sadly, the connecting hardware being a new technology...... rarely perform to the stated marketing stats........under ideal conditions in the R&D department, with carefully matched hardware and several paid technicians working 50hr weeks around it..........but not you and I for a year or two.
DMs advise is Correct as far as I know and sound advise to forget the Marvell 6gig SATA for the time being........The Marvell port will work fine as SATAII or ....Don,t connect anything to them, disable the Marvell controller in BIOS and (Possibly important for you) Disable Marvells update chip option, this is possibly why your system (OS) keeps "Goin a huntin" for the missing drivers bugging you no end.....Hope this helps.
Aussie Allan