The memory situation has me a bit confused. This was the RAM I ordered: 2 x 2 GB of F3-12800CL9D-4GBRL. It's DDR-1600, but when I built the machine, it defaulted to DDR-1333 speed, which I expected from reading reviews beforehand. On the first day, I switched the voltage from 1.4v to 1.5v where...