By now we all know that the PlayStation 4 features an AMD CPU+GPU, with 8 GB of RAM. But recent teardowns of the console have revealed that the PlayStation 4 has a secondary processor, a co-CPU, with its own dedicated RAM.
The secondary processor, known as SCEI CXD90025G, is based on the ARM architecture, common in smartphones and other smaller devices. It has its own dedicated ram — 256 MB of DDR3 SDRAM memory.
This is the processor that likely deals with all the background tasks, such as downloading, streaming live gameplay videos, and more. In addition, it has 256 MB of flash storage on the board as well. We’ve previously reported that the PlayStation 4 also features a hardware upscaler chip, to upscale content up to 1080p.
As mentioned before, the secondary CPU deals with minor tasks such as downloads, voice chat, and video transcoding. All of that frees up resources from the main CPU, which is used for games.
It’s interesting to see how far we’ve come in just one console generation. Consider that the PS3 had 256 MB of main system memory. Now that same amount is used just for background tasks in the PlayStation 4. We can only imagine how things will be in the PS5…