First off, you need a motherboard that supports Dual Channel DDR. And yes Dual Channel DDR is faster. You get between 5% -25% performance increase. The better the Ram, the better the performance increase. Also, make sure it's Dual Channel DDR Memory, like OCZ and Corsair packaged together. These memory DIMMs are specialy selected for Optimal Dual Channel DDR. In other words, the memory companies try and match each DIMM identicaly.