I have four RAM slots on my motherboard. I'm currently using two. For some reason, when I plug in a third (and fourth), I can only use the new RAM, and not all of it combined. It's a "dual channel" motherboard, and admittedly, I don't know what that means.
So this is probably a really n00b question, but does anyone know why I can't use every slot at the same time? And if I can't use every slot, why even include extra slots?
Update: Here's all the technical specs I know...
I'm running Windows 8 Pro 64-bit (RTM). I'm using DDR3 RAM, but I'm not sure what clock speed or whatever. I have two 4 GB sticks currently installed, and I'm trying to install two more 4 GB sticks, to bring the total to 16 GB. My motherboard has four RAM slots, and it supports "dual channel" RAM, although I'm not 100% sure what that means. Hopefully that's enough information to go on.