Originally Posted by TyrantII
Just a comment on Neogaf, but I couldn't find anything to verify it. If you're doing instant task switching and have apps running, wouldn't some need access to the GPU?
The way I currently understand it, games take priority over apps - you can run two apps side by side, but you can't run a game and an app side by side. Apps can stay suspended in the background for fast switching and running services on the CPU (like on Win 8/iOS)...but I cant think of any reason they'd need to utilize the GPU in that state. A game probably has exclusive access to the GPU. Hitting the home button to bring up the blades might temporarily require the game to give up some resources, including the GPU, to run the overlay....but once that's closed, it should release it entirely back to the game.
Can't think of any reason they'd need to put aside two whole CPU cores either, and 3GB is quite a bit more than I'd have expected. Its possible though, depending on how quickly they want to enable switching away from games. If they want to do it really, really quickly, they'd need to reserve a good chunk to keep the apps resident in memory. I suspect that like iOS, many apps will stay resident until a game starts demanding some of their memory, in which case they'll start saving their state to disk and releasing the memory to the game, in the order in which they were last used. Every app should still come right back to where you left it, including games, but depending on their current state of suspension, the time it'll take will vary from almost instant to a few seconds.
The way they intend the console to be used, I dont think they'll set any hard limits beyond what the OS itself requires, maybe 1GB or so. If all you do is ever run apps and never games, the remaining 7GB could be used entirely for you to switch between dozens of apps, lightning quick.