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What is your portal usage like? What are the number of user sessions per day?
From my experience, the more RAM you have the better off you will be, although I don't think logger and the API are very RAM intensive.
You could probably get away with your current setup, although the latest WebCenter 11g and WebLogic will need a lot of RAM.
Keep in mind that the operating system uses RAM too!
Check your Task Manager: Performance tab's "Peak Commit Charge" which displays the maximum amount of memory your server has used since it was last restarted.
If that number is more than 75% of your Physical Memory total (displayed on the Performance tab) then you'd probably get some benefit.
If your Peak is > your Physical Memory then you definitely need more memory.
The peak on our 2 front end servers is 3gb and the average total commit is 2.5gb, so 2gb of physical wouldn't be sufficient in our case.
Our config is the same as yours, but we have anti-virus and backup software (backup exec) running too.