Qimonda is one of the first to have the DDR3 memory out and the chaps from OCW played with DDR3-10600 memory or 1333 if you prefer it that way.
They managed to overclock the DDR3 memory all the way to 770 MHz or effectively 1540MHz. This is the fastest we've seen that kind of memory work, but at 10-10-10-28 latencies, which isn't too sexy.
It is a nice read and the memory scores are up sky high in Sandra, but in real life you won't gain that much.
You can check the whole story here and they have some screenshots as well.