RAM for my MOBO

Well yes, that's even better although starting frequency for DD3 is 1066MHz and everything over that can be considered as OC. so even 1333MHz is kind of OC. If RAM and MB/BIOS have and can use XMP profile there are few steps in between.
It's also slightly better to have two sticks than one larger one because than they can run in Dual channel mode and pick up some more performance that way.