Need to use 16GB Ram for Rendering

Hello everyone, i have 2 x 3GB Quad Core 16GB RAM. i am trying to use my full memory or at least 10GB of memory for rendering in After Effects. Any help will be very much appreciated. Whenever i render it shows i am using 3GB of RAM (default), but i really need to use more RAM to have shorter rendering time. please help. thanks

Giuliana,
On Mac OS X, each AE process can use 3.0 GB of RAM. By turning on "Render Multiple Frames Simultaneously" in the Preferences (in CS3 or CS4) AE can start hidden copies of itself to use more processors to render more than one frame at a time.
Each such hidden process can use 3 GB, so with 10 GB of RAM I'd recommend you use only 3 processors. In CS4 you can tell AE only to use 3 processors, in CS3 you have to edit a text file, as outlined here:
ihttp://generalspecialist.com/2007/02/troubleshooting-after-effects-7.asp
When all 8 cores try to render a complex or memory intensive composition with Render Multiple Frames Simultaneously, the application can become memory starved if each process has insufficient memory. If you have less than 2 GB of available RAM per CPU core, your hard drive will be used as temporary RAM which is at least 100 times slower than real RAM.
To remedy this, there is a text preference in the preference file to control the maximum number of cores that Render Multiple Frames Simultaneously will use.
Open the text preference file and look in the ["MP"] section for:
i "MaxNumberOfProcesses" = "0"
"0" is the default setting, which means that all available CPU cores will be used. Calculate how much RAM you have available for After Effects (don't count the RAM used by your operating system.) If you have 8 cores and 8 GB of free RAM, change the setting to "4" so that 4 CPU cores will be used and so they will each receive 2 GB of RAM.
Save the preference file and restart After Effects.
You can find the preference file Adobe After Effects 8.0 Prefs.txt in the directory (on Windows):
i C:\Documents and Settings\XXXYOUR_LOGIN_NAMEXXX\Application Data\Adobe\After Effects\8.0
...or for OS X:
i Users/XXXYOUR_LOGIN_NAMEXXX/Library/Preferences/Adobe/After Effects/8.0/
- Jonas Hummelstrand
http://generalspecialist.com/

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