I'm thinking of getting 64 bit W7. I currently run 4gb Gskill Ripjaws 1600 9-9-9-24 timings. If I were to get 64 bit and another 8 gbs of RAM (2x4gb 1600s) can I use the 8gbs in, say, slots 1&3 and the 4gbs in slots 2 & 4 (or whatever slot combination therein)? I just wondering and I have the mobo manual at home but I'm at work right now. Thanks.