Pc reboot after upgrading ram

[Johncop]

So I have a a88x mother board and a a10 7870k black edition cpu, I previously had one 8gb stick of viper ram at 1886 1.5 MHz I bought two more sticks same year make model and MHz now my of reboots after about 10-15 minutes of running I previously over locked the single stick to 2133 but defaulted it back to 1886 when I installed the other two and ideas? Btw voltage reads on sticks runs from 1.48-1.499

 

[Johncop]

That was sposed to say 1.5v and over clocked not locked