64-Bit-what does that mean

Photoshop CS5 is now capable of running in native 64-bit on both Mac and Windows. This means Photoshop can now address hundreds of gigs of RAM (instead of just 4 GB). The results are speedier operations-the bigger the file, the bigger the difference. The 32-bit version is on the same disc, so if your third-party plug-ins haven't been updated yet, you can run Photoshop in 32-bit.

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