When computer starts up a green screen tells me only 3 cores are activated or something to those lines. How do activate the 4th core and is there a point to activating the 4th core? I mean do pc games really even take advantage of that 4th core or does any software like video encoding take advantage of it? But also, why is it off to begin with? Weird... So right now I'm on an Amd Phenom II x3 965 3.4ghz?