Just showing the trick to get higher frequencies working on the MSI X79A-GD65 (8D). Previously, the wall was 4800MHz, now I can get it well over 5GHz. Confirmed working by other overclockers as well. Trick is needed on BIOS V1.3 and earlier; not sure if future BIOSes will have this fix.
For more information, check HWBOT forums: http://hwbot.org/forum/showthread.php?p=138397&postcount=5