World record overclocking RAM is the effective frequency of 4620.2 MHz, which was obtained by the Greek overclocker Sofos1990 with modules of RAM standard DDR3. The memory type DDR4 can overclock up to higher frequencies
On the first world record overclocking DDR4 memory yesterday was by G.Skill company , modules which were used for this experiment. The author of the achievement was Shamino, who also took the motherboard ASUS Rampage V Extreme processor and Core i7-5930K. For cooling with liquid nitrogen.
According to the testimony of CPU-Z, the memory was overclocked to 4004 MHz effective frequency with timings of 17-25-29-50. No doubt, in the near future, this result will be improved.