carwiz: the link to the IRST drivers are the same as i first got and it was this one i tried out.
I have the Marvell 9128 on my motherboard P6X58D-E and my read speed peaks at about 417-419mb/s and my SSD is plugged into this port.
I have added my benchpic for reference. Would i benefit from running my Corsair Force GT 120Gb on the Intel SATA2 port using IRST driver?
Agree with the posts above, haven't read up on the new Marvell controller (my board has the old, slow, one) but it has been mentioned that it is much better.
Make sure you have the latest driver, and let us know how the performance is.
With the numbers i now have and get i´m using the Marvell driver
1.2.0.1006 WHQL (Xp/Vista/7), i dont remember which firmware i have flashed to but it´s a new one, not the version that came with the mobo. I think its the version that came with the new BIOS 0701 for the mobo, but i´m not 100% sure. I could be firmware
2.1.0.1413.
Which firmware version is best for the marvell chip 9128?
Addition to my previous post: I have the Marvell 9128 controller.
Do a search with your marvell chipset 9128 and the newest firmware and your SSD and see if there are any serious issues.
There are always posts with issues, just read through a few to see if it's a wide spread problem or specific to certain hardware/people.
I've been meaning to do this but haven't gotten around to it, will start checking one of these days.
EDIT: Just had a look around, checked a couple of sites and they are still recommending to stay on the Intel SATA II ports.
This Marvell controller doesn't pass the trim command, and is not very stable according to some.
How to Ensure SATA III TRIM on X58A-UD3R, Intel 510 6GB/s SSD, Marvell 9128?
Two things, I'd advise you not use Marvell drivers on the 9128 controller, although the newer drivers are better performance-wise, they still remain less stable than using MSAHCI.
There is no TRIM passed through on the Marvell controller, with any driver, or any BIOS mode settings.
The Intel SATA 3Gb/s controller would be better for any 6Gb/s drive, simply because it is way better at random performance, the only thing the 6Gb/s port is better at is Sequential speeds which really don't have much of any effect on performance.
Should I use ICH10R or Marvell SATA/600 controller?
In fact, I can squeeze my Marvell 9128 to near 500MB/s reads versus my ICH10R's paltry 280MB/s reads and still see that the Intel's slightly reduced latency(and stronger small file performance) gives greater percieved advantage in typical OS duty regardless of nearly doubled read speeds. The ONLY reason I keep the V3 on my Marvell is because I have 8x HDD raid which can take advantage of that stronger read speed. If I just had single drive storage/small HDD raid?.. I would most definately be running it on the Intel becuase it's slightly better all around.
Guess I'll wait until I get a new motherboard for the new SSD.
The newer Marvell controllers are doing better, but the 9128 even with firmware/driver updates is lacking, according to my search.
/Edit.
This is one site I have used to get my Intel drivers, they have Marvell drivers also.
Station Drivers - Marvell
They are showing the same driver but, newer firmware.
I don't use my Marvell ports, my Intel SSDs are happy on the Intel SATA II ports.
My next SSD may need the 6GB/s Marvell ports, so I would like to know how the performance on the 9128 with new drivers is working.
Let me know if you decide to update the firmware and driver, and if you see any improvement.
Check to make sure Write Back Cache is enabled in Device Manager for the drive. 
