Pavilion p6313w with M2N78-LA (Violet6) mobo - Can I upgrade my Ram to 16GB with Corsair XMS3 16GB (2x8GB) DDR3 1333 MHz (PC3 10666). Specs say I can upgrade to 16GB but if you use 3 or 4 slots, speed goes from 1333 to 1066. Was going to go 4x4BG, but didn't want to lose speed. Let me know if 2x8GB is possible.