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I know there is a myth about more RAM is better, but in the days of OS 9 and earlier, the rule of thumb was to have 3 times as much RAM allocated to Photoshop as the file size you intend to work with. Reason being is that the file needs to be stored in the buffer memory and each time you perform a task and "save" the entire file needs to be rewritten first to a scratch disk then back to the buffer. So you have the original file = 300mb plus the buffer size =300mb and the scratch disk (where the file is temporaily written as a save is done) =300mb hence if you work on files that are 300 mbs in size you would want to have at least 900mb or 1gb of RAM aloocated for Photoshop to work as efficiently as possible. Any more was a waste of RAM as the program never accessed it.
That said and knowing that in OS 10.x you can only specify the % of available RAM any program can use I would just keep Photoshop at about 25% if you have 8gb of RAM. any more would be wasted and not allow other programs to access it.
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\"No well engineered plan survives contact with reality\" Me
Mac-OS
Presstech 5334 DI
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