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The read performance of a RAID 5 array is greater than that of a single drive because data can be read from multiple disks simultaneously. Disk writes do not realize the same benefit because parity must be calculated and written to all the drives.
To enhance the write performance of RAID 5Intel® Rapid Storage software has implemented a RAID 5 volume write-back cache.
The volume write-back cache allows writes to be buffered and improves coalescing. The cache is disabled by default, but can be enabled by the user through the Intel® Rapid Storage
To enable the Write Cache of the RAID drive, you will need to access Device Manage and right click on "Disks" section.