Aurosonic

Hey guys, need professionals help. I'm on XI Formula with latest 0805 bios and G.Skill F4-4266C17-32GTZR kit. Been working on stock XMP frofile with tightened secondary and tertiary timings. One of memory sticks seems died. I'm getting instant CC post code in each slot. Other sticks works fine. There's nothing i can do right ? And it's warranty time ? Been working with this config for 3 month. Suddenly during game my system hangs and i won't be able to boot again untill find this dead stick.