>    The scene geometry cannot be loaded all at once onto the GPU RAM if the
> scenery is huge (which is the case at least with open sandbox games and even
> non-sandbox ones if the scenery is very detailed). The scenery has to be
> loaded dynamically as the player moves. The more RAM you have, the less
> loading needed and the faster the game.

Why should loading the scenery from disc slow down the game?  It's done 
in the background before you get to the part of the level where the 
scenery is needed (the same way stuff is transferred from the CPU RAM to 
the GPU RAM on PCs).  Otherwise it would be impossible to race around a 
huge areas like the Nurburgring (or cities on GTA) on the PS3 without 
"Loading..." screens half way around (which would be a little stupid for 
a car driving game) :-)

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