Random BSOD few idle and few playing.

[Wiiwa]

Heya!
I got few BSOD without clear reason.
Here's little about my setup (custom made):

i5-4670K 3.4Ghz (first it was OC'd to 4.2ghz stable, tested with prime95 for 12h. after 2 bluescreens i dropped it to default settings. system is running <50´C even with 100% CPU usage, with or without OC)
Gigabyte Z87-D3HP
MSI Geforce GTX 660 2048mb
Noctua NH-D14
Kingston HyperX blu 8gb 1600MHz DDR3 CL9 xmp
Samsung 840 EVO SSD 250gb

Got so angry when I lost my diablo 3 char coz of BSOD

logs gathered with SF tool, please ignore atleast 3 first dumps. They were caused by OC failures

Thank you!

 

[Wiiwa]

I ran last night memtest86 ~8h: zero errors. Also I ran earlier Prime95 blend w/o errors and for last GPU burn test with FurMark also w/o errors.
So this must be software related