Intel repeatedly had to deal with problems related to the functionality of chipset, in modern motherboards perform the functions of the controller I / O hub. Suffice to recall defective chipsets X79, surrounding the processors generation Sandy Bridge-E, they were deprived of additional ports SAS support.
The current chipsets generation - X99 - is also not perfect. Officially, the solution supports 10 ports SATA 6 Gb / s, with used to manage a set of drivers Rapid Storage Technology, supplied by Intel. Characteristically, the latest version of drivers under the number 4.1.0.1046 support TRIM command for SSDs running in RAID 0 and ten SATA ports proprietary software detects only six. The other four are controlled by the standard Windows driver and can not be used for RAID-arrays.
By the way, the version of Rapid Storage Technology 4.1.0.1046 disappeared from sites ASUS, ASRock, Gigabyte and MSI.