You have a good system, although I would have preferred a Seaburg instead of a Greencreek chipset with the Harpertown. For instance the X7DWA-N.
The crashes should not occur on such a system, so there must be something else in your installed software that causes these crashes. I assume you have checked all your BIOS settings and these do not cause problems.
Have you checked your event manager logs? Anything strange?
Can you post info from Process Explorer on what is running?
Setting up a Raid array should be done from the BIOS.
Harm Millaard