You lose effeciency after a certain point. This is obvious when the OS fails to fully detect the full amount of ram installed. Some have been getting by 3gb seeing no problems while not seeing any great benefit over simply having 2gb for an even dual channel configuration. Vista sees better performance with the simple increase from 1gb to 2gb due to new features added being loaded up along with Windows there.
Those are loaded into ram just like Windows or any other OS. The system takes a small piece and the primary still remains available for your games or apps you decide on running. The simple idea with two channels is to drive the background services seen in XP as well as Vista seeing more added there while the main apps run out in front in that sense.
To start off with having more then 4gb max is worthless unless seen on a 64bit not 32bit system. The only 32bit version of Windows that can utiliize a larger amount of ram is the Windows 2003 server edition upto some 32gb there. At least there was a tweak for the older Fat32 versions to see over 512mb then. So far nothing has been found for XP and now Vista. Sooner or later you will probably see 100gb boards out but no support seen for 32bit OSs or softwares. No gain there. And after 64bit eventually 128 followed by 256 to be followed by 512bit and then ...?
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