The latest PS3 2.80 Update (optional) adds more than what you can find in the changelog. Naughty Dog’s Sam Thompson confirmed stated that more RAM memory was made available by the reduction of memory consumption from the consoles operating system.
The memory reduction mainly is important to game developers, when asked what improvements were made to the latest Uncharter 2 Multiplayer (Beta), he replied:
Naughty Dog is constantly working to improve every aspect of the gameplay; be it animation, lighting, sound, texture fidelity. You know if you look at the game itself with the 2.80 engine update, you know we’re adding more memory, so we get a lot more utilisation of the SPUs, so we increase our optimisation of the Cell processor as well.”
“So we’ve got from the engineering side all the way up to texture fidelity, artists adding in even more…I mean there’s really not a singular aspect that’s not been improved in the game,” Thompson added.
The PS3 memory was reduced to about 74mb at firmware 1.80, currently the new reduction amount is not known, but is getting closer to the Xbox 360′s 32mb.