How about some of this? Runs at over 2800 with no voltage increase?
http://www.overclockers.com/gskill-tridentx-ddr3-2666-memory-review
They got 2944Mhz with 11-13-13-35 timings.
Or these:
http://www.overclockers.com/gskill-tridentx-ddr32600-cl10-ram-kit-review/
Ran the same as the 2666 kit with the same timings overclocked at 2940 but did 10-12-12-31 at 2800 and 9-11-11-28 at 2600
http://www.overclockers.com/gskill-tridentx-ddr3-2666-memory-review
They got 2944Mhz with 11-13-13-35 timings.
Or these:
http://www.overclockers.com/gskill-tridentx-ddr32600-cl10-ram-kit-review/
Ran the same as the 2666 kit with the same timings overclocked at 2940 but did 10-12-12-31 at 2800 and 9-11-11-28 at 2600