The originally released 500GB HDD PS4s had manufacture serial numbers of the form CUH-10XXA; a minor modification with a different form of WiFi Microstrip antenna was registered in mid 2014 as part numbers CUH-11XXA.
In mid 2015, the CUH-12XX series (as variants CUH-1215A and CUH-1215B with 500GB and 1TB storage respectively) were certified by in the USA by the FCC. Differences between the CUH-11 and CUH-12 series included a reduction in rated power from 250W to 230W, a reduction in weight from 2.8 to 2.5kg, and physical buttons. The CUH-12xx series are also referred to as the “C chassis” variant of the PS4.
In late June 2015, a 1TB CUH-11 series machine was announced for European/PAL markets.
The CUH-12 series was officially announced in June 2015, releasing first in Japan, then worldwide. Changes to the design included a matte black HDD cover replacing the original gloss black version. Other minor changes to the design included mechanical buttons replacing electrostatic touch sensitive ones, and a shorter LED indicator on the top surface of the console. Internally the CUH-12 series included a number of minor changes, including the change to 8 memory modules of 1 GB (from a previous 16 modules of 512 MB).
The PlayStation 4 uses a semi-custom accelerated processing unit (APU) developed by AMD in cooperation with Sony and is manufactured by TSMC on a 28 nm process node. Its APU is a single-chip that combines a central processing unit (CPU) and graphics processing unit (GPU), as well as other components such as a memory controller and video decoder/encoder. The console also includes secondary custom chips that handle tasks associated with downloading, uploading, and social gameplay. These tasks can be handled seamlessly in the background during gameplay or while the system is in sleep mode.
Though not much is publicly known of the PS4’s audio capabilities, the console also contains a dedicated hardware audio module, which can support in-game chat with minimal external resources as well as “a very large number” of MP3 streams for use in in-game audio.