Hi Kamk21, Welcome to THW.
Here are the supported RAM speeds the Sabertooth motherboard will support: Memory Standard DDR3 1866/1800/1600/1333/1066.
And here is a link to the QVL "Qualified Vendor List"
on the Ausu website that lists all the brands and models of RAM Asus tested to work with this board(Click on the Memory/Device Support Tab and then DL the DRAM QVL.pdf). Keep in mind the RAm you choose does not have to be on the QVL to work, those are just the models that were tested and confirmed to work by Asus.