it is Promos chipset mate.

Liar.
Me and soulfly already told him not to confuse people about the ram that he's selling uses Micron D9DCN.

Snyy, the earlier batch overclocks well, as in the earlier batch Team Valueram DDR2 PC2-5300 667MHz uses ProMOS chipset.
But the latest batch no longer uses ProMOS chipset.
I bought two stick for my own use directly from my supplier, tested, and it doesn't overclock well enough.

Dude, if you really want to overclock your ram, perhaps you should dig deeper in your pocket and get the rams that is built for overclocking.

Example:
Team Xtreem Dark or Team Xtreem [Any speed]
Crucial 10th Annivessary DDR2 PC2-5300 667MHz 1GB
Crucial Ballistix or Crucial Ballistix Tracer [Any speed]

And some other specific model from some other brand.