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Photoshop CS4 64-bit in Windows, only 32-bit in OS X

Right after announcing the release of 64-bit support in the Lightroom 2 beta, Photoshop Senior Project Manager John Nack dropped a little bombshell on his blog, announcing that the next version of Photoshop (CS4) will be available in both 32- and 64-bit versions for Windows, but only a 32-bit version for OS X. The reason: Photoshop on OS X is written with the Carbon API. Last June Apple decided to kill 64-bit Carbon, forcing all future 64-bit application development on the Mac to Cocoa. Adobe had originally planned to ship a 64-bit CS4 as a Carbon app and port to Cocoa for CS5, but now the 64-bit version will have to wait for the CS5 Cocoa build.

The (relative) good news is that this will primarily affect users working on "very large files on a suitably equipped machine." The average speed bump "due to running in 64-bit mode is around 8-12%" when not "using a large data set." The bad news is that it is precisely those professional users who buy Mac Pros maxed out on RAM that will likely get penalized. It'll be a sad day when the Photoshop jockeys have to run in Boot Camp to get the most out of their Mac Pros.

[via Daring Fireball]

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To find out what version of Mac OS you are running, go to the Apple logo in the top left corner, click it and choose About This Mac. From that window you will see the version number, processor, memory and chosen startup disk. Clicking Software Update will check for updates, and More Info... will open up an extensive list of everything on your machine.


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