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Mac OS X isn't fully 64-bit, meaning that zero customers can run 64-bit applications, and 64-bit Windows has penetrated to a "vanishingly small percentage" of customers. "The number of situations in which an application being 64-bit is a performance win is very small," he said.įrom a market perspective, 64-bit applications require 64-bit chips and operating systems, neither of which is a given. And 64-bit data structures, being twice as big as 32-bit ones, are therefore bigger consumers of memory bandwidth. When it comes to calculations, many 32-bit chips already can handle 64-bit math operations, he said. The 64-bit x86 chips have more internal memory slots called registers, which help a bit, but main memory access speeds aren't any faster on 64-bit chips.
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On the technology side, 64-bit chips permit easier access to more than 4GB of memory (Windows only lets an application use a maximum of 2GB Mac OS X will dole out up to 3GB). Issues involving technology, performance and support mean that Photoshop will remain 32-bit software for the time being, Byer said. That wasn't this time around," said Photoshop co-architect Scott Byer in a blog posting last week, addressing feedback on the public Photoshop CS3 beta asking for a 64-bit version. "At some point it will make sense to do a 64-bit version. Adobe plans to build a 64-bit version of its flagship image-editing software, Photoshop, but the upcoming CS3 version isn't the place to make that plan a reality.