Are these memory modules any good?

[sociable.nomad]

Ive been lookin over some memory modules on www.trademe.co.nz (a local version of Ebay) and here a a few Ive found, just lookin for a few opinions on their quality (ie: are they any good?) the links are below:

http://www.trademe.co.nz/Computers/Components/Memory/1-GB-or-more/auction-59859047.htm

http://www.trademe.co.nz/Computers/Components/Memory/1-GB-or-more/auction-60368253.htm

http://www.trademe.co.nz/Computers/Components/Memory/1-GB-or-more/auction-60232034.htm

http://www.trademe.co.nz/Computers/Components/Memory/1-GB-or-more/auction-59961515.htm

http://www.trademe.co.nz/Computers/Components/Memory/1-GB-or-more/auction-59856779.htm

bear in mind the costs are in NZ$

thanks -SM-

[Thrax]

OCZ yes, the rest, no.

[sociable.nomad]

and my other question: is it better to get one stick of 1gb or 2 sticks of 512mb ram if I intend to over clock the computer? do things work faster one way as opposed to the other?

[Thrax]

For any modern PC, 2x512 is preferred to enable dual channel memory, however if you're overclocking with the intent to play games, 2x1GB is preferred.