Frequently random BSOD.

I've been getting BSOD frequently. When i'm playing games, surfing on the web, even while it's in idle. It's rly annoying. Any help is welcome. thx Gigabyte GA-870A-UD3 v2 QuadCore AMD Phenom II X4 Black Edition B55, 3.8 GHz 2x4Gb Exceleram DDR3 1600 MHz NVIDIA GeForce GTX 275 WD Caviar Green 1 TB Chieftec CTG-600-80P