Mhj,
If you have the Raid configured with mechanical HDDs you can accelerated by using the Intel® Rapid Storage Technology. It is also necessary to have an SSD of 18GB or more plus other components which I guess you already have since you have the RAID already setup.
Here you can find the acceleration guide for your system:
http://www.intel.com/support/chipsets/sb/CS-032826.htm?wapkw=(Smart+Response+Technology)
Hope It helps!
Kevin M