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p.1 #14 · CS4 32 bit default ??? Not 64 bit | |
Yes, if you install Photoshop CS4 on a computer with a 64 bit OS, it will install both the 32 and 64 bit versions and you can use either. If you have plugins that have not been upgraded to 64 bit, then you can open and use them in the 32 bit version of CS4, which will only use approximately 3.25 GB of memory or RAM. If you open the 64 bit version of CS4 then it will use as much of that 8 GB as you assign to it under Preferences. Adobe recommends 70%.
However, your OS will use as much RAM as is available, in this instance 8 GB. So, if you are working in PS CS4 32 bit, that program will use up to 3.25 GB and if you have other programs open, such as email, a browser, a word processor, etc. they will all continue to run well because there is still sufficient RAM available to them to run efficiently.
While computing is moving towards a 64 bit environment, not all programs can yet take advantage of it. As well there are still lots of programs that are not yet coded to use more than one core of multicore processors. I believe that's the case with some of the filters still in use in Photoshop.
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