i had the same problem a year back turned out my new RAM was faulty , i replaced it & everything was OK, test your RAM to make sure it is allright, since you have 2 ram's , run the pc with only one stick, one by one, see if it solve your problem
first of all if that 450W is not from the reliable brand you have to immediately change it if you want to use 970 in your PC & buy atlest 500 or above watt psu from a reliable brand (seasonic, corasir etc), otherisw i am sure you will put your whole pc in danger
i am very sure that replacing your PSU will solve the problem, i had pretty similar problem a month ago & was solved by replacing the psu with the better one
also one more thing, when my computer is in very les load like browsig or idle it min. voltage never goes below 11.6 but when i game it goes as low as 11.3 as you can see, is it normal?