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.
But the big news is that Photoshop now comes in both 32- and 64-bit Windows Vista versions. 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. 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.
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. Photoshop requires that you manually allocate a specific amount of RAM to it, rather than its acquiring the RAM on the fly. 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. The amounts will vary depending on your system, especially your graphics card.
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. Obviously, most people don't need that sort of capability, but many professional photographers shoot with large- or medium-format cameras with digital backs that can capture nearly 40 megapixels or even higher, and they often create much larger compositions. Adobe says that Photoshop keeps its editing history in RAM for as long as possible, too, so even if you're working with smaller images but making lots of edits to them, allocating more RAM will help you in that situation as well. For people who do work on very large images, it's probably more cost-effective to buy more RAM for your PC than to buy large RAID systems, and Photoshop will probably perform better.
Running the 64-bit version will provide little performance benefit other than the ability to address more RAM. And even a system with lots of RAM won't be able to avoid reading and writing data to your hard disk--a process that still proves time-consuming. I got to watch a dialog box for a coffee-break-length period when I asked Photoshop to apply a simple monochrome gradient to my 5.6GB file.
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