I will use with i7 4930k so motherboards should support quad channel memory. There are two different spec, one of them says sabertooth is quad and the other one says it is tri-channel.
>> http://www.guru3d.com/articles-pages/asus-tuf-sabertooth-x79-review,3.html says quad
>> http://motherboards.specout.com/l/2/ASUS-Sabertooth-X79 says tri-channel
>> http://www.guru3d.com/articles-pages/asus-tuf-sabertooth-x79-review,3.html says quad
>> http://motherboards.specout.com/l/2/ASUS-Sabertooth-X79 says tri-channel