Well I am also experiencing the dreaded 16 code.I bought the mb and it ran fantastic untill after about 21 hours of non continuious use.I got the blue screen of death,rebooted and booted all the way to window ran fine .I turned computer off for the night and whenI restarted in the am computer went into continuios reboot displayinf 78, D3 and 16 .I contacted Asrock tec and they werent all that helpful. I tried clearing the cmos using recomended method with the jumpers, moving ram . I am using 2 gskill 4 gig each 1600 sticks dual channel.Tried all connections and even checked to make sure processor was seated correctly. I will RMA if no one has a helpful sugestion.Thank-You in advance