I just passed 32M at 5GHz DDR3-2133 8-8-8-24 88 1T
That is with the UD7 bios F7d, my DIMMS are in slots 2 & 4

2133 7-7-7 has never been good for me on my ES or this retail chip.....but 7-7-7 was fine at 1866 as you stated Ed

These DIMMs also run fine at 1866 6-6-6-18 60 1T on x58 with 1.7V....but they wouldn't even boot with my ES D1....still have not tried on my retail D2