Quad-core chips have been used on some high end smartphone, such as Samsung Galaxy S III, HTC One X, and LG Optimus 4X HD. Dual-core chips are available on mid-end devices like Xperia U. Unfortunately, low end smartphones can’t use a dual-core chip because the price is too expensive.
MediaTek has just announced MT6577, a dual-core chip for smartphone under $200. It has dual Cortex A9 chip clocked at 1 GHz with 512 KB of level 2 cache, as well as Power VR Series SGX 5 GPU. The chip supports HD 720 x 1280 pixels display and 1080p (Full HD) video recording.
Smartphones using MediaTek MT6577 are predicted to be available in Q3 2012. Some manufacturers to use this chip are Gigabyte, ZTE, and another Asian manufacturers.