Use SD-card as ram

I have a Mac mini fall 2012 with 4GB ram, and have heard that I can use a SD-card as Ram
I know that it runs slower, but still do you know how to do it?

You are thinking maybe the swap files can be moved to an SD card, under the impression that maybe virtual memory paging will be faster going to a solid state storage device, then going to the mechnical rotating media boot drive?  It is a good theory, however, the SD card inferface and typical SD cards are slower than most disk drives.  NOTE: moving the swap files to an external drive/SD card is non-trivial, non-standard, and could easily go wrong.
As clintonfrombirmingham said, upgrading the RAM in the Mac mini is a better use of your time and momey.  Or replacing your internal disk with a high quality fast internal SATA 2.5" Solid State Disk (which will give you the faster virtual memory paging with a device that is fast using an interface that is also fast.  But RAM First. Alway more RAM first.

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