My g/f sweetly bought me a Dell XPS model and not knowing any better only selected the 8GB DDR3 option instead of 12GB DDR3. The thought hadn't ever crossed my mind until I swapped out my graphics card that I'm only running in dual channel. I looked to see if I could buy the ram off newegg and they don't stock it. However, Dell does and wants $40 per 2GB stick. Is there anyway to add another 4GB (according to dell 12GB is the mobo max) without buying the exact memory? Do I just need to make sure it's the same Mhz and match up all the latencies? Or will I just need to buy 3 matching sticks?