I would say, bad stick. Have you tried this with other RAM? What RAM are you using? We have MB, GPU and OS... Are you using all lanes or...? Still, looks like bad sector somewhere. Good Luck.c.
or.. one stick at a time to see which stick is bad.. black, like Raja suggested on another post..lat.7 from all ive read, here and other places...that seems to be one of the tricks....magic 7.
Your Welcome, the Pleasure is Mine, Sir or Ma'am.c.