Have you checked out the all new Nvidia APX2500?
What is Nvidia APX2500?
Well to begin with, APX2500 is the all new mobile GPU for Windows Smartphones.
Its main quality is industry's first HD 720p video on a mobile device. And thats no lie. Not only nvidia will give industries finest display and 3d performance, but also bring HD-Quality to your phones and that too without utilising much processor, battery and ram.

Official Features:-
NVIDIA® HD AVP (High Definition Audio Video Processor) with PureVideo® technology
Capture or playback of HD 720p movies with your mobile device
Unprecedented picture quality and ultra-smooth, vivid movie playback with low CPU utilization and power consumption
Superior Imaging
Take sharp and steady pictures with a 12MP camera with built-in image stabilization algorithm
Integrated Image Signal Processor (ISP) with proprietary algorithms enables image and video stabilization, face tracking, and advanced trick modes
NVDIA ULP (Ultra Low Power) GeForce® technology
World's fastest GeForce graphics technology architected for low power applications
Superior 3D user interface capabilities based on a unique compositing framework delivers seamless web browsing
NVDIA nPower™ technology
Enables the industry's longest HD video and MP3 playback on your phone
Architected to deliver optimized system power utilization
True dual display subsystem for flexibility of use
Entertainment – watch a movie on an HDMI display and use your phone as a remote control device
Business – present your proposal on a SXGA projector using your phone as a pointing device
Personal – show your favorite photos on the television while previewing them on your phone

Official Specification:-

Sounds nice, I spoted a little mistake however(?)..

it should be

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