KHX:DDR3  - It's Here - HyperX DDR3 memory, the next-generation evolution of DDR memory technology. Like all Kingston HyperX products, HyperX DDR3 modules were specifically engineered and designed to meet the rigorous requirements of PC enthusiasts. HyperX DDR3 offers faster speeds, lower latencies, higher data bandwidths and lower power consumption. HyperX is available in single and dual channel memory kits.

DDR3 is the next generation of Double Data Rate (DDR) Synchronous Dynamic Random Access Memory (SDRAM). It is an evolution of DDR and DDR2 memory technology that delivers higher speeds (at launch up to 1066MHz for ValueRAM^® memory, beyond 1333MHz for HyperX® memory), lower power consumption and heat dissipation.

Kingston HyperX modules will begin at 1333 and most likely continue to 2GHz in the future.

Memory modules (Unbuffered, Registered, Small Outline DIMMs) have a special “key” or notch in their connector. These keys must align with a key in the memory socket to allow the module to be inserted. All DDR3 and DDR2 module types are keyed differently.

 

More information can be found on Kingston Technology's Website 

JEDEC Memeory Specifications

The chart below summarizes some of the differences in the official JEDEC DDR2 and DDR3 specifications.

JEDEC DDR3 specifications define standard DDR3 CAS Latencies of 7, 9, and 10:

-1066MHz DDR3: CAS 7 (7-7-7)
-1333MHz DDR3: CAS 9 (9-9-9)
-1600MHz DDR3: CAS 10 (10-10-10)

More information can be found on JEDEC's Website