In the 64-bit version, I was able to create and work with an image of 45,000 pixels by 45,000 pixels, for a total of a little over 2000 megapixels and a 5.6GB file size.

The amounts will vary depending on your system, especially your graphics card. I was able to set the 64-bit version to take up 6879MB of RAM, and to set the 32-bit version to consume 3185MB of RAM. Photoshop requires that you manually allocate a specific amount of RAM to it, rather than its acquiring the RAM on the fly. I tested betas of both the 32- and 64-bit versions of Photoshop CS4 by installing them on a workstation with dual Intel Xeon CPUs, running Windows Vista 64-bit and 8GB of RAM. With the shrinking amount of RAM available to modern PCs (due to a 4GB limit on 32-bit Windows versions and those operating systems’ increasing hunger for RAM), that’s a significant update. The 64-bit edition will allow PCs with lots of RAM to work on very large images with less hard-disk swapping (ideally, no swapping at all), thus speeding up operations.

Adobe’s new Photoshop CS4 packs a ton of fresh features and an updated interface, which alone make it a worthy upgrade for existing users.īut the big news is that Photoshop now comes in both 32- and 64-bit Windows Vista versions.

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