IMO Mike's mention of drivers can be a big gotcha. Scanner drivers aren't an issue here, as none of the machines in question have scanners attached. I'll ask about the plugins, but I think we only use the ones that ship with the product. On my CS5 installation the bit version has an extra FirewireExport plugin. I don't know about the additional plugins -- I imagine that there's a few that are deprecated and haven't been built for bit.
The bit will use most of your available RAM. I found some more info from Adobe; see below. If you are using the bit version of Windows, then Photoshop only installs the bit version. Photoshop CS6 allows you to choose one or both of these versions to install.
Photoshop CC installs both versions. Photoshop CC and later installs the bit version on a bit OS by default. You can download the bit version here. Photoshop installs a bit and a bit shortcut into the Start Menu. If you need to manually run the application, the bit version is the photoshop. The bit version is the photoshop. RAM use Windows The primary advantage of using the bit version is to access amounts of RAM beyond what Photoshop can access when the bit version is run.
It's not necessary for Photoshop to swap out to the hard disk. Third-party plug-ins for bit versions of Photoshop don't appear under the Filter menu when you run the bit version of Photoshop.
If it's necessary to use plug-ins that haven't been updated, run the bit version of Photoshop. When you are done using the plug-ins, close the bit version. Then, run the bit version. Contact the plug-in manufacturer for information about any updates. Processor speed and Photoshop operations: Although the bit version of Photoshop speeds up some operations, it doesn't speed all of them.
And, it doesn't speed the operation equally. Overall, processor speed is not the main advantage of using the bit version, except when you run actions on large files. Photoshop writes data to the hard disk incrementally while you pause in Photoshop. When you run actions, there are no pauses for Photoshop to write to the disk. Therefore, Photoshop writes to the disk while the action runs. The increase in processor speed increases the speed of these processes.