It is official – Samsung Galaxy S II gets 1.2 GHz dual-core processor
Rumors about a possibly more powerful CPU replacement have been circulating since February, but the speculations never got confirmed by the manufacturer. It was also reported that we were going to see the snappy Tegra 2 chipset in some Galaxy S II variations, but the news about the upgrade does not make it clear whether Samsung still plans to use Nvidia's processor too or to write it off completely. We should be able to find the answer to that as soon as the smartphone gets its official release later this month.
source: Samsung (Facebook Page) via GSMArena