CPU: AMD "Jaguar" x86-64 (custom) @ 1.6 GHz (octa-core)
GFX: AMD Radeon HD 7870 "Pitcairn" (custom) @ 800 MHz
SND: AMD TrueAudio DSP
MEM: 8 GB System (3.5 GB OS / 4.5 GB Games)
RES: Up to 1920x1080p (4K for photos and videos)
OS: Orbis OS v2.02 (UI: PlayStation Dynamic Menu)
The APU (CPU+GPU on the same die), codenamed Liverpool, has an official model: CXD90026G SoC.
There is a Sony CXD90025G ARM co-processor for background tasks with its own 256 MB of SDRAM.
It also features a dedicated chip used for upscaling media (including games) and a dedicated sound chip for handling voice chat, compression and decompression of audio streams.
The OS is a fork of FreeBSD 9.