I haven't used a RAM disk in years, but back when I had a 286 with a whole megabyte of RAM, DOS could only use 640K. I don't recall what application I was using (probably RAMDISK.SYS), but it used the upper 360K for a RAM disk, which allowed me to move things around a lot faster. I haven't checked yet, but I'm sure there are applications that will do the same for today's hardware.