The HTC O2 will employ the Snapdragon 820 chipset, which will feature a quad-core CPU (carrying four custom Hydra cores) with the Adreno 530 GPU. 4GB of RAM is inside, along with 64GB/128GB of internal storage. A 20.7MP rear-facing camera adorns the back, and a 5MP snapper up front handles selfies and video chats. The very un-HTC like 3500mAh battery will keep the lights on for a long time, and the front panel will be narrow with thin side bezels. Speaking of the front, it sounds like the BoomSound front-facing stereo speakers will return. There is also talk that the device will have an IP certification with protection against dust and water.
The report goes on to say that a 5-inch version of the HTC O2 will be launched next year, sporting a 2K or 4K (!) resolution. A more powerful Snapdragon 82X chipset will power the handset, with an octa-core 3.X GHz CPU. The remaining specs should match what is alleged to be on this year's 6-inch version of the phone.
In terms of design, the report says that the O2 and the HTC One series do not deviate from each other by that much. We are looking forward to seeing some more details about the handset soon.
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source: Mobile-Dad (translated) via GSMDome