The real secret in PS3 firmware 2.80 - Gamezine.co.uk
It's now clear what was involved with the update; more RAM memory was made available, most likely due to the reduction of memory consumption for the console's Operating System (OS). How do we know? This information was provided by Sam Thompson, the producer of Uncharted 2: Among Thieves, during an interview at this year's San Diego Comic-Con.