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And just a PITA when fiddling around behind a PC case IMO

In my personal view, if you want to call something SFF-Ready AT ALL it should be based on the original PCI/PCIe spec

[ATTACH=full]3706[/ATTACH]

So I would suggest absolutely max of 111mm tall, 40mm thick (i.e. DUAL SLOT not 2.1, 2.2, etc) with considerations for power connectors and cable routing etc. for full sized cards.

Badge / Category	MAX Length (mm)	MAX Height (mm)	MAX Thickness (mm)	Example Card
SFF Long	312	111	40	IDK if there are any true dual-slot cards that could fit here???
SFF Standard / Reference	267	111	40	AMD Reference RX 6700 XT [URL unfurl="true"]https://www.techpowerup.com/gpu-specs/radeon-rx-6700-xt.c3695[/URL] nVidia RTX 3070 FE [URL unfurl="true"]https://www.techpowerup.com/gpu-specs/geforce-rtx-3070.c3674[/URL]
SFF Short	225	111	40	PowerColor Fighter RX 6600XT [URL unfurl="true"]https://www.techpowerup.com/gpu-specs/powercolor-fighter-rx-6600-xt.b9199[/URL]
SFF ITX	150-180	111	40	HP RTX 3060 Single Fan [URL unfurl="true"]https://www.techpowerup.com/gpu-specs/hp-rtx-3060-oem.b9077[/URL] PowerColor Radeon RX 5600 XT ITX [URL unfurl="true"]https://www.techpowerup.com/gpu-specs/powercolor-rx-5600-xt-itx.b7724[/URL]
SFF LP	190	69	40	Gigabyte RTX 4060 LP [URL unfurl="true"]https://www.techpowerup.com/gpu-specs/gigabyte-rtx-4060-low-profile-oc.b11375[/URL]
SFF LP ITX	170	69	40	nVidia RTX 4000 SFF Ada [URL unfurl="true"]https://www.techpowerup.com/gpu-specs/rtx-4000-sff-ada-generation.c4139[/URL]

Anyways, just my 2c