This was done for the GEIL HWBOT memory competition, one of the stages was to push 4x 4GB memory modules to the maximum possible frequency.
I achieved this frequency of 2720MHz using a Gigabyte X58A-UD7, 4 GSKILL Trident 2000 8-9-8-24 4GB modules, my single stage running at -50 degrees celcius and a western digital 600gb velicoraptor