The best replacement for ramdisk is tmpfs.

The best alternatives to ramdisk are rated as following:
★★★★★  tmpfs
★★★★  pcie ssd
★★★★  ramfs
★★★  ram cache
★★★  ssd minecraft
★  initramfs
★  dimmdrive
★  imdisk
★  readyboost
  eboostr
  ready boost

Your alternative for ramdisk is not listed? Suggest!
Speaking about ramdisk, one probably shouldn't forget about chrome.

Other search terms related to ramdisk and their ratings are:
★★★★★ chrome
★ readyboost
You have in mind a companion for ramdisk and it is not yet here? Propose!



Google Trends

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ramdisk
tmpfs
pcie ssd