This is what I know about my motherboard:

Asus M2NSLI Deluxe AM2 ATX-Support AMD Socket AM2 CPU- AMD Live Ready-NVIDIA nForce 570 SLI

Currently I have two of these RAMS:

512MB, 240-pin DIMM, DDR2 PC2-4200

And I want to upgrade something really fast. Does my motherboard support DDR3? Can someone suggest something?