Hah, I was incorrect and thinking of Photoshop CS2. CS3 was improved: http://kb.adobe.com/selfservice/viewContent.do?externalId=kb401089&sliceId=2
Optimize performance in Photoshop CS3 on Mac OS ID:kb401089OS Macintosh ... Allocating Memory above 2 GB with 64-bit Processors When you run Photoshop CS3 on a 64-bit operating system, such as Mac OS X v10.4 and later, Photoshop can access up to 8 GB of RAM. You can see the actual amount of RAM Photoshop can use in the Let Photoshop Use number when you set the Let Photoshop Use slider in the Performance preference to 100%. The RAM above the 100% used by Photoshop, which is from approximately 3 GB to 3.7 GB, can be used directly by Photoshop plug-ins (some plug-ins need large chunks of contiguous RAM), filters, and actions. If you have more than 4 GB (to 8 GB), the RAM above 4 GB is used by the operating system as a cache for the Photoshop scratch disk data. Data that previously was written directly to the hard disk by Photoshop is now cached in this high RAM before being written to the hard disk by the operating system. If you are working with files large enough to take advantage of these extra 2 GB of RAM, the RAM cache can increase performance of Photoshop. The default RAM allocation setting in Photoshop CS3 is 70%. These settings should be optimal for most users. To get the ideal RAM allocation setting for your system, change the RAM allocation in 5% increments and watch the performance of Photoshop in the Activity Monitor. You must quit and restart Photoshop after each change to see the change take effect. ... Godfrey On Jun 25, 2008, at 8:26 PM, William Robb wrote: > > ----- Original Message ----- > From: "Godfrey DiGiorgi" > Subject: Re: OT: Mac Computer > > > >> Photoshop CS3 will use at most 2G RAM no matter how you push it. > > Perhaps on a Mac...... > > From: > > http://kb.adobe.com/selfservice/viewContent.do?externalId=kb401088&sliceId=1 > > "Allocating memory above 2 GB with 64-bit processors > Photoshop CS3 is a 32-bit application. When it runs on a 32-bit > operating system, such as > Windows XP Professional and some versions of Windows Vista, it can > access the first 2 GB of RAM > on the computer.The operating system uses some of this RAM, so the > Photoshop Memory Usage > preference displays only a maximum of 1.6 or 1.7 GB of total > available RAM. If you are running > Windows XP Professional with Service Pack 2, you can set the 3 GB > switch in the boot.ini file, > which allows Photoshop to use up to 3 GB of RAM. > > Important: The 3 GB switch is a Microsoft switch and may not work > with all computers. Contact > Microsoft for instructions before you set the 3 GB switch, and for > troubleshooting the switch. > You can search on the Microsoft support page for 3gb for information > on this switch. > > When you run Photoshop CS3 on a computer with a 64-bit processor > (such as a, Intel Xeon > processor with EM64T, AMD Athlon 64, or Opteron processor) running a > 64-bit version of the > operating system (Windows XP Professional x64 Edition or Windows > Vista 64-bit) and with 4 GB or > more of RAM, Photoshop will use 3 GB for it's image data. You can > see the actual amount of RAM > Photoshop can use in the Let Photoshop Use number when you set the > Let Photoshop Use slider in > the Performance preference to 100%. The RAM above the 100% used by > Photoshop, which is from > approximately 3 GB to 3.7 GB, can be used directly by Photoshop plug- > ins (some plug-ins need > large chunks of contiguous RAM), filters, or actions. If you have > more than 4 GB (to 6 GB), then > the RAM above 4 GB is used by the operating system as a cache for > the Photoshop scratch disk > data. Data that previously was written directly to the hard disk by > Photoshop is now cached in > this high RAM before being written to the hard disk by the operating > system. If you are working > with files large enough to take advantage of these extra 2 GB of > RAM, the RAM cache can speed > performance of Photoshop. Additionally, in Windows Vista 64-bit, > processing very large images is > much faster if your computer has large amounts of RAM (6-8 GB)." > > > William Robb > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above > and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
