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Tip #228: How Much RAM Do You Need For Editing?

More RAM helps – to a point.

This chart illustrates how RAM needs increase as frame sizes increase.
RAM requirements for 30-fps, 8-bit video at different frame sizes (MB/second).

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The way most NLEs work is that, during an edit, the software will load (“buffer”) a portion of a clip into RAM. This allows for smoother playback and skimming, as you drag your playhead across the timeline.

When a clip is loaded into RAM, it is uncompressed, allowing each pixel to be processed individually. This means that the amount of RAM used for buffering depends upon several factors:

  • How much RAM you have
  • The frame size of the source video clip
  • The frame rate of the source video clip
  • The bit-depth of the source video clip

This graph illustrates this. It displays the MB required per second to cache 8-bit video into RAM. As you can see, RAM requirements skyrocket with frame size. These numbers increase when you have multiple clips playing at the same time.

NOTE: These numbers also increase as bit-depth increases, however the proportions remain the same.

The amount of RAM you need varies, depending upon the type of editing you are doing.

  • 8 GB RAM. You can edit with this amount of RAM, but editing performance may suffer for anything larger than 720p HD
  • 16 GB RAM. Good for most editing.
  • 32 GB RAM. My recommendation for editing 4K, 6K, multicam and HDR.
  • 64 GB RAM. Potentially good for massive frame sizes, but not required.

Anything more than 64 GB of RAM won’t hurt, but you won’t see any significant improvement in performance; especially considering the cost of more RAM.


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4 Comments
    • Larry Jordan
      Larry Jordan says:

      Patrick:

      Smile…. at $24K for 1.5 TB of RAM, I can wait a bit.

      Truthfully, NO video editor needs that much RAM, even for Multicam editing using 16K frame sizes.

      Larry

      Reply

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