Corsair announced it managed to overclocked a single DDR3 memory module to 2462MHz:
Verified and validated by CPU-Z, Corsair Labs achieved an astounding speed of 2462MHz at CL=9 with a single-rank 1GB module. This new world record eclipses all previous CPU-Z validated memory benchmarks. This record was set using Corsairâ€™s award winning DOMINATOR DDR3 memory module paired with an Asus P5E3 Premium motherboard based on the Intel X48 chipset. This is now the highest achieved DDR3 frequency of all time.