The PS4 has an extra 256MB of DDR3 ram.

[Conina]

fatslob-:O said:

Conina said:

The PS3 used even over 100 MB for it's OS after the launch. The OS footprint was reduced over the years: http://community.eu.playstation.com/t5/PlayStation-3-General-Discussion/PS3-OS-memory-footprint-slashed/td-p/9874872

I expect similar OS-optimizations for the PS4, XBO, WiiU, 3DS and Vita i the next years.

I actually don't expect optimization for the PS4 since processors aren't allowed with multiple memory controllers. It looks like the OS will use 256MB for it's whole life and I doubt games will use it since access times will probably be incredibly shit. 

I'm talking about reserved GDDR5-RAM for the OS, the 256 MB DDR3-RAM have nothing to do with it.