I know it would be disgusting to see a 2 GB RAM model of SGS3 model in India but few countries are already having it. Also in some countries Quad Processor is not delivered and SGS3 has been supplied with dual Core. 
the markets getting the dual core version is the one where this phone has 4G LTE support. the quad core processor does not have lte chip so samsung (and htc too for one x) have to switch to a dual core processor to support 4G networks.
the markets getting the dual core version is the one where this phone has 4G LTE support. the quad core processor does not have lte chip so samsung (and htc too for one x) have to switch to a dual core processor to support 4G networks.