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Ole Pa
Ole Pa
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Max RAM for CS5 on 64-bit MacBook Pro

Mar 16, 2012 6:26 AM

Tags: #cs5 #ram #64_bit

Hi -- CS5 is running slowly on on MacBook Pro, which has a 2.8 Ghz intel core 2 duo processor which = 64 bits.  Adobe's web page at this link

 

  http://helpx.adobe.com/photoshop/kb/optimize-performance-photoshop-cs4 -cs5.html

 

shows the following on max RAM

 

CS5, 32 bitMac OS2.1 GB
CS5, 64 bitMac OSAs much RAM as you can fit in your computer

 

When I open CS5 on my Mac and look at the menu under "Photoshop > Preferences > Performance" it clearly shows max RAM of 2100 MB (or 2.1 GB).  This would be correct if my Mac was a 32-bit machine, but it's a 64-bit machine.  Has anyone else seen this, and has anyone figured-out how to correct it?

 

-- Thanks in advance, Ole Pa

912 Views   5 Replies   Latest reply: Noel Carboni, May 16, 2012 3:11 PM
 
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  • Curt Y
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    1. Curt Y,
    Mar 16, 2012 8:17 AM   in reply to Ole Pa
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    This would be and OS thing.  You did not say how much ram you have installed, perhaps it is 3 gig?

     

    Check you computer readout to make sure OS is seeing all the ram you have.

     
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  • Ole Pa
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    2. Ole Pa,
    Mar 16, 2012 8:58 AM   in reply to Curt Y
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    Hi Curt -- Thanks for the post and for point-out my ommission. I have 8GB of RAM installed, and the About This Mac menu confirms this is the case.

     
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  • PECourtejoie
    4,685 posts
    Jan 11, 2006
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    3. PECourtejoie,
    Mar 16, 2012 9:36 AM   in reply to Ole Pa
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    Hello, you need to check if Photoshop was not set to start in its 32 bits mode: http://helpx.adobe.com/photoshop/kb/plug-ins-photoshop-cs5.html#main__ How_to_run_Photoshop_CS5_in_32_bit_and_64_bit_modes

     
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  • Jp Cooper
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    4. Jp Cooper,
    May 16, 2012 2:19 PM   in reply to PECourtejoie
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    Having the same problem.

     

    CS v5 - MacBook Pro - dual 2.3ghz Core i5 - 4GB RAM

     

    Running PS in 64-bit mode

     

    PS shows only 1.488GB of available RAM to use.

     
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  • Noel Carboni
    20,953 posts
    Dec 23, 2006
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    5. Noel Carboni,
    May 16, 2012 3:11 PM   in reply to Jp Cooper
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    Verify it's x64 by doing Help - About Photoshop and looking for x64 in the About dialog.  If it doesn't say x64 there, you're running the 32 bit flavor.

     

    The setting for changing the max RAM you're allowing Photoshop to use is in the Photoshop - Preferences - Performance dialog.  Note that 64 bit or no, it won't let you use it all up, as it knows your system needs some of it to run.  But you can probably give it more than you are at its current settings.

     

    -Noel

     
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