What is a value select memory?

need to know that what is the term

value select memory

is ?

whats the difference between an ordinary kingston ddr2 memory and this corsair value select memory ?

more over please discuss on the factors to b consider whn buying the memory module .

i want to buy a new 2 gb memory module ddr2 for 1333 mhz processor and 1333 board.

Value Select is the cheaper average performance part. Hyper-X and others are high performance gaming PC parts.

The former doesn't have a good overclocking head room but the latter does.