Hi, Can anyone explain the difference between these two ram types, please? http://www.geil.com.tw/products/showSpec/id/14 and http://www.advancetec.co.uk/acatalog/info_22110555.html I have the corsair product installed but the MB (Asus A8N-E) does not work with the Geil ram. Also, the corsair product says 400MHz but when I use cpu-z, it is running at 200MHz - why is this? Where did I go wrong?!