Are the sticks of ram the same speed? Have you tested each stick by it self to rule it out? What about something that tests memory like sandra or the ultimate boot cd?
it didn't occur to me to do that, because my ram worked in regular mode
I loaded my bios setup defaults (which disabled caching my bios, video ram among other things) and it has lock up yet. I've ran it all day and I forgot I put it in dual channel mode.