G.Skill has announced that overclocker YoungPro of TeamAU has broken the record for fastest DDR3 memory using a set of G.Skill TridentX memory. This set of memory runs at a stock speed of 3000MHz CL12 and YoungPro was able to push it 4400MHz CL13. The world record overclock was set on an ASUS Maximus 6 Impact motherboard alongside an Intel Core i7 4770K CPU with additional assistance from Liquid Nitrogen cooling. Validation of the overclock can be found at HWBot and CPU-Z.
Source: Press Release