Can I put 2x2GB sticks of RAM in with 2x512GB sticks for 5GB without any negatives? I realize the possible negatives aren't really worth the extra 1GB I'd get but I'm stuck paying for it so I'd rather use it than not. Should I just bite it and not use it, or is there really nothing to worry about with mismatched RAM? (It just seems like a bad idea to me)