I am not sure what you are asking. Any frequency above 1333MHz requires an XMP profile (even 1600MHz requires an XMP profile). While it is true that the DX79SR board is hardened to support faster memory, there is no guarantee that anything above 1600MHz will work and the chances of it working drop as you go higher and higher. While I still had one of these boards, I never myself saw anything above 1866 work. I have heard of people getting 2133MHz working, but I was never able. Remember too that using memory running at above 1600MHz is a form or overclocking and this can void any warranty you have left.