yeah it could be shotty ram. bad ram tends to do that stuff.
also make sure your not trying to overclock em.
or mixing ram types, in case you left older ones still in there as well. (good idea but can cause issues)
I would try using 1 stick at a time. swap them into the first slot and start up and play a game an hour each.
theres a good chance just one of em sucks. return the other