Here is link to a new Mantle review that Tomshardware did and it reallys shows why Intel wants the tech IMO.. just look at what that FX 4170 is able to do under Mantle.
http://www.tomshardware.com/reviews/amd-mantle-performance-benchmark,3860.html
http://www.tomshardware.com/reviews/amd-mantle-performance-benchmark,3860.html