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Cyberbeing said:
On Win7 x64 with CS6 x86, it seems to be able to handle up to the following dimensions for freshly opened images:

B5 8-bit @ 13308x18784 (1856 ppi)
B5 16-bit @ 10074x14220 (1405 ppi)

A4 8-bit @ 13312x18766 (1604 ppi)
A4 16-bit @ 10110x14250 (1218 ppi)

8-bit @ 16384x16384
16-bit @ 11648x11648

That it can just barely handle A4 16-bit (48-bit color) scans @1200 ppi is the only interesting limit out of the above, considering 1200 ppi is the optical resolution of many scanners.

You probably need at least 6GB of RAM to reach these limits though.

(Photoshop 3GB + Greyc Helper 1.4GB + Windows OS 1GB)
Last time I tested this was last year with my "r213 cs6 mod" (which reverted back to the older r57 memory allocation method) prior to admin2 posting a fixed version. Though I would assume it is still true that it can just barely handle up-to A4 16-bit @1200 ppi with GraycShop only, assuming you are running Win7 x64 with at least 6GB of RAM. But yes, this assumes that your image in Photoshop has been freshly opened, and you'll likely need to immediately save, exit, and re-open your image afterwards...

Having a 64-bit version would be nice.