Can I allocate RAM as disk space- like the old 'RAM disk' back in the day

I've got 11 gigs of RAM, and Photoshop wants <4. Is there a way I can allocate some of the leftover RAM through the OS-- similar to the old 'RAM disk' back in the day? If I could, I could make it the primary scratch disk for Pshop and hopefully see a significant in-app speed increase.
I'm posting this as an OS question, not a Pshop question.
Thanks

You would need to search at VersionTracker or MacUpdate to see if there is a compatible utility for a ram disk. There were several such animals around but nothing more recent than 2008. They may still work, but no assurances that they do. Use with caution. Be sure to check that they are Intel compatible at the very least.

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