In a high end Mac Pro, what is an ideal scratch disk setup?

Discussion in 'Design and Graphics' started by Sean Dempsey, Jul 23, 2007.

  1. Sean Dempsey macrumors 68000

    Sean Dempsey

    Aug 7, 2006
    Mac Pro Quad 2.66
    5 gigs of ram
    Scratch 1 set to an emptry Raptor 10,000rpm drive.

    With this setup, I am really not hitting the scratch disk ever. I have PS set to use 2.5 gigs of ram, and I believe after that if it needs scratch disk, it writes to the remaining 2.5 gigs of ram before the actual disk, am i right?

    That being said, I have read that have 1 large scratch disk all to PS is better than having multiple scratch disks. Right now, I have the 150gig raptor empty, used only for scratch, and also a 75 gig partition on another drive, but I don't use it.

    With as much ram as we can get nowdays, what is the best setup for scratch disks, especially when using web-sized files?
  2. BornAgainMac macrumors 603


    Feb 4, 2004
    Florida Resident
    Edit: [Nevermind. I remember Photoshop and it's scratch disk setup]

    Are you refering to swap space? Activity Monitor will show you Page In / Page Out with system memory. The higher the number, the more it is using the swap space. To get a better idea, try taking out some memory on your machine and stress test it to see those numbers go up if you want to see your scratch disk setup in action. Or perhaps you can stress test it with the memory you have now by loading as much as you can on your machine.

    Adding additional memory is faster than depending on a scratch disk setup.
  3. iMeowbot macrumors G3


    Aug 30, 2003
    Right, it prefers main memory over scratch if you have more than 4GB RAM.

    Well, since your images are small enough that you aren't using scratch anyway, the answer is nice and simple for your case: it doesn't make any difference :D

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