The setup:
Cpu - i7 3960x
ram - 32gb [4 x 8gb] G.skill 2400
vga - Gigabyte GTX 680
hdd - 2 x 2tb Seagate on grey marvell ports
dvd drive - Lg BD on black intel port
bios - 0525 - set to defaults except uefi enabled
The hdd's have had mbr and partiton sectors wiped.
The issue:
When attempting to install win 7 x64 to a raid array on the marvell chip, the install fails at the 'choose a drive' screen with the error - "Windows cannot be installed to this disk"
Details of which are: "This computer's hardware may not support booting to this disk. Ensure that the disk's controller is enabled in the computer's BIOS menu"
Information gathered:
This error only occurs with x64, x86 works fine, though of course only 2tb of the array is available with x86
Here's the odd thing which may lead to an explanation and fix.
Normally, a raid volume is not visible in win setup until the appropriate F6 drivers have been loaded.
This is not the case with the marvell chip on this m/b, the raid volume is already visible before any drivers are loaded.
Interestingly, it's the same when installing x86, the volume is already visible before any raid drivers are loaded.
The difference being that x86 has no error message and will install, x64 has the errror message and won't install.
If you do press ahead with installing x64, at the first reboot you will get a message - no bootable devices found.
If you try to 'update' the phantom f6 driver with Intel's f6 x64 marvell driver, it loads ok but the error is still there
So the question now is - why is the raid volume visible before an f6 driver has been loaded? Where is it getting this phantom driver from?
Is it buried in bios somewhere? However it's doing this, I suspect it is the reason x86 works and x64 fails.
It can't be from the win dvd, as I also have a Gigabyte G1.Assassin 2 board which has the same chip config and the raid volume is not visible until you load the f6 driver and both x86 x64 work fine.
All theories welcome 
Have revisited this issue and tried every possible config of single drive 500gb, two drives 500gb each [unconfigured], two drives 500gb each in raid0 and then the same again but with 2tb drives.
None of them will allow x64 to be installed.
Please Intel, tell me I'm doing something wrong here. Live chat have advised that this should work.
The board is a brick to me unless this can work.
Maybe it did work with the original bios and now it has been broken in 0525?
Edit: I should add here that x64 boot on marvell is possible but only if you disable uefi, which means no more than 2tb boot volume on either controller.
So the options are:
Single sata3 boot volume of any capacity
Dual sata3 boot but only to volumes of <2tb
I managed to get Win7 x64 to run on the Intel RAID, but it required a lot of troubleshooting by Intel and they finally supplied me with this driver:
It's worth a try if other people find this and can't get the RAID to work.
Hi, thanks for your input.
The driver you have linked to is rst for the Intel controller. My problem is with the Marvell controller.
I've never had a problem with installing 7x64 to a raid volume of any size on the Intel controller, with any version of rst.
