This is completely expected since you are not allowed to accelerate a RAID volume that is part of a matrix RAID. In your case you have a matrix RAID of RAID 0 volumes in just one array.
You will be only able to accelerate a RAID volume if that volume is the only one in a single array.
When I initially bought my GA-Z68XP-UD3 motherboard and an i7 processor I had the following configuration working perfectly:
Intel SATA 0 & 3 - 2 x OCZ 128GB SSD in RAID0 configuration
Intel SATA 1,2 & 4 - 3 x Seagate 1TB HDD in RAID5 configuration
Intel SATA 5 - 1 x Runcore 60GB SSD e-SATA in accelerated mode
About a month ago my PC all of a sudden started to go a lot slower and I eventually tracked that down to the RST saying SSD was not longer available for acceleration. I upgraded the RST software to the latest version and the accelerate button disappeared altogether
Why did Intel provide a marvellous opportunity and then sudfdenly take it away without any warning?
The only conclusion I can come to is there is some form of marketing ploy being used here though I believe it is quite underhand to use this sort of approach
If it is not a marketing ploy why did the accelerate optioin work so well for at least 6 months before it was withdrawn and what level of drivers gets me back to the place I was when I purchased the system?