I'm doing my first build, most of my parts were delivered yesterday and my case is coming today. I ordered a Gigabyte motherboard that supports 1066 with 4 memory slots. I also ordered 4GB (2x2GB) of 1066 RAM. My old computer (the one I'm on right now) has 3GB (1x2GB and 1x1GB) of 667. Of course I plan to use the new 1066 in my new build, but I'll have 2 open memory slots. Should I put the 3GB from this computer in my new one? I know if I do that my 1066 will run at the slower speed, but would the extra 3GB make it worth it?