How do you know if its on DC or SC. I have a Shuttle AN35, and have one stick on the black slot closest to the CPU, and another stick on the first blue slot next to the black one. I have tried all of the combinations I can think of, and it will not effect my mem scores on Sisoftware. I tried just one stick and got the same score. So I am at a loss here. I knew I should of kept my K7S5A.