Overclocking is only needed to games that are really slow (I don't know any one getting slow with the Adreno 320) or to get more points in benchmark's. If you wanna try your Mi-2 in best performance get some good ROM like WIUI and set the power mode to "Performance" (that set all 4 core's to full clock)... It's a great performance and I didn't see the Mi-2S.