It might sound like a bad thing, but it’s more than enough.
The PS4 has a total 8GB of dedicated GDDR5 memory, 3.5 of which is saved for the operating system, with the remaining 4.5 for gaming. This isn’t concerning, since memory is shared between all the systems goings on, but it is interesting that the Xbox One uses only 3GB for the OS.
According to Digital Foundry, an extra 1GB of memory will float around in the system for games, on top of the 3.5 dedicated.
However, Sony recently announced the console will run a dedicated hardware encoder to record consecutive 15 minutes of gameplay, whilst the Xbox One will only record five.
Rumor has it Sony will be working to reduce the amount of memory required for the operating system, which will be required to increase longevity of the games and maximise graphics.