Corsair and SuperTalent DDR3
 

There is absolutely no doubt that these are blazing fast DIMMs using
cutting edge technology - 1,800MHz equates to PC3-14400, while 1,866MHz
is PC3-14900. However, the speed does come with a price and it's not
even worth considering these absolutely premium modules unless you're
the type of person who will buy the latest and fastest kit as soon as it
arrives, regardless of cost. It does provide some future-proofing to a
certain extent, because 1,800+MHz will still be faster than any
motherboard can officially handle for quite a while yet - even the X48
chipset due out in January will only increase the official memory
capability to 1,600MHz.

http://www.bit-tech.net/hardware/200...z_at_1333mhz/1