Samsung 990PRO in USB4-case - with or without heatsink ?

Usage: backups of user-data volume, bootable clone of system volume.

First USB4-compatible computer to be purchased short till medium term. So far only USB 3.0 setup. Will it be possible to use new 990PR0 in USB4-case this setup as long as USB4-capable system not there?

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One of the strong suits of USB is the downward compatibility. So it should work. But check the description of your enclosure.

You can run a 990 Pro without a heatsink but be prepared for thermal throttling when you use the drive a bit more. TBH getting a 4.0 case is kinda pointless without a heatsink
- Thanks for information. How well may enclosure’s own heatsinking perform, e.g those enclosures in amazon black friday offer, ONRICO brand certain number of models, for US 100 up to 112USD. Or Acasis in similar price range.
  
  Ask "the ssd guy" on reddit at:
  
  https://www.reddit.com/r/NewMaxx/comments/17lhez9/ssd_help_novemberdecember_2023/