if i tighten my heatsink to tight OR overclock a tad unstable I get this weird problem. it only allows me to use 2048mb out of 4096mb of ram! cpu-z detects all 4gb in dual channel mode, BUT windows or any other program only see's 2048mb?? even at POST it will only show 2048. im just wondering if others have this problem or not. i am using a backplate, and am using a venomous-x. I do not have the preassure screw tightend at all, in fact i can move the cooler with my hands it dont move easy but it will move (using this to show it isnt SUPER tight).