My motherboard is an ASUS P5QL PRO. I am running 2 sticks of Kingston Hyperx 1GB RAM. They are DDR2 running at 333mhz each. They aren't dual channel. What is the major difference in running a dual channel to running my current setup? And what are the major differences in DDR2 667-800-and so on? Any suggestions on getting a new brand of RAM?