Samsung Galaxy S3 has a 4.8″ 720p display. It also was the first device to have a quad-core Exynos 4412 processor, with each core clocked at a maximum 1.4 GHz. It packs NFC, wireless charging capability, and the latest wireless radios. It ships with Samsung’s Nature UX interface. At the time of its launch, it ran on Android 4.0.4 ICS.
CyanogenMod team have been successful in developing the CM 12 custom ROM for the Galaxy S3. The ROM is still in the development stages but you can try it out on your device. Follow the guide given below.