The Amlogic AML8726-M is a cheap SoC (System on a Chip) for Android tablets and smartphones. It integrates two ARM Cortex-A9 cores (max. 1,5 GHz) with SIMD extensions and an ARM Mali-400 graphics card. Furthermore, the chip supports hardware decoding of 1080p videos according to Amlogic.
The Rockchip RK3066 is a cheap ARM based SoC for Tablets and Smartphones. It integrates two ARM Cortex-A9 (ARMv7) CPU cores with NEON extensions, a ARM Mali-400MP4 (quad-core clocked at 250 MHz) graphics card and a video de- and encoder as main components. The integrated memory controller supports a maximum of 2 GB DDR1, DDR2 or DDR3 memory.
The CPU cores can be clocked up to 1.6 GHz depending on the cooling solution of the tablet / smartphone.
Additional Features according to Wikipedia
VPU (Video Processing Unit) Multi-Media Processor supporting 1080p image and video decoding
HDMI 1.4 Interface
2-channels TFT LCD Interface with 5 layers and 3D Display (1920×1080 Maximum Display Size)