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In reality you're correct here Bert. The limiting factor of Photoshop performance these days is DRAM bus bandwidth, not CPU. Allocating RAM to a separately-managed pool such as a RAM disk merely steals it from what's available directly to Photoshop to fool around in at lightning speed.
With 12Gb you'll probably never hit any paging limit thresholds in real life - unless you try to stack a couple of thousand 12Mp images at once. Just remember - 12Gb is NOT a lot of RAM when you consider Photoshops buffers. Rule of thumb is to have 4-5 times the amount of physical RAM you think you need to open a file and perform tasks on it. You need to cater for undo history, snapshot, pattern buffers, not to mention room for the file itself.
Go to your Info pallette options and turn on "efficiency". This will display how Photoshop is coping given its available resources. You want to see it read "100%" constantly. If it ever dips below 90% you're running out of RAM and are starting to page to disk. More RAM required!
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