Quote Originally Posted by stephen23 View Post

is 12mmX8mm
Hmm. Are you sure it's not 11.5x8mm? If it's really 12 and not 11.5 it would indicate much older Micron ICs.

they use these chips coz they can make 2GB stick?
Yes. In terms of 1Gbit ICs you would need 16 of them to create a 2GB memory module, which is a common amount.