Why Photoshop CS5 don't use memory available before zero?

I gave PS CS5 access to 80% of the memory of the machine (about 8.5 of 12 GB).  Yet, it seems to (at most) use of 3.5 GB of ram, using 1 or more GB of scratch disk.

I had hoped that with a lot of memory, I would avoid using scratch.  Am I misinterpreting what I see?  Is there something I need to do to get the behavior I want (i.e. do not use zero down on the ram)?

Thanks for any help.

Photoshop uses RAM as fast as he can, but he must also allocate zero space in which case it takes the contents of the RAM page.

If you have lots of RAM, this workspace can go unused, but it must be reserved in advance, just in case it should be used.

Tags: Photoshop

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