also I think with the striker extreme there are revisons that will overclock a quad but I have seen the same problem your posting alot so I'm not sure what to say. I have a rule if it is a pain in the ass I give it my all and move on.
read this http://www.tomshardware.com/forum/244093-30-asus-striker-extreme talks about the strikers problems with quad cores and 1333 fsb