I am building a gaming rig and want to put 2 gig of ram in it. I'm just confused as to what type of ram I should use. Crucial has Ballistix DDR 3200 with 2-2-2-6 Latancy that come in 512MB sticks or they have Ballistix Tracer DDR 4000 with 3-4-4-8 Latency in 1 gig sticks. So my question is what difference does speed (DDR3200 v. DDR4000), Number of sticks (2 v. 4), Latency, and Voltage make? Which is the most important for gaming?