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I'll throw in my two cents.

  • I'd be happy with the old reference dimensions (267x111x40mm) as a new SFF standard. I'd be cautious of breaking it up into multiple standards though so as to not split an already niche market and cause consumer confusion.
  • I'd like to see recessed PCIe power connectors as part of the standard, ideally forward-facing at the top edge of the card. This would maximize compatibility with different styles of SFF case while still being in an easily accessible location (something which IMO would be an issue with [USER=4401]@SaperPL[/USER]'s idea of putting it on the lower edge of the card).

Quick mock-up:



I will add, taking into account cooling needs I could see an argument for extending the maximum length up to 290mm or so to allow for triple ~92mm fans. This also maximizes the use of space in M1, sandwich, and console layout cases where you'll need a minimum of 300mm or so for a mini-ITX board and SFX PSU anyway.