Thanks everyone for your input. It is my understanding that the card I returned (Quadro RTX 3000 MXM) is the correct form factor, but I was missing the MXM-to-PCIe x16 adapter card.
If I had known this earlier, I would have kept the card, and ordered the converter card. Oh well.
I did a bit more digging, and the RTX 3000 card model N19E-Q1-KA-A1 which I bought is not a MXM card, hence it is not compatible with MXM converter card, as suggested by speedstep.
The correct model is N19E-Q1-KD-A1, such as this model by PNY, which is inded MXM, and probably would work with the MXM converter.
It seems nVidia ships the chip using a variety of different connectors, so careful research needs to be done to assure the right card is purchased.
I only noted MXM would not physically fit based on what was posted. I never said that the MXM conversion would FIT. I specifically said that only a TOWER model would work at all with MXM card.
The card you specify is a daughter board that needs a right angle riser and a board to mount to that plugs into an X16 slot on the compact model.
Dell Precision 7730 7740 use RTX 3000
These are Dell's proprietary form factor, the Dell Graphics Form Factor (DGFF)
speedstep
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Posted October 28th, 2021 20:00
@Chino de Oro MXM is not PCI-E form factor so I don't understand "right card"
The sub compact unit in your picture has a riser card which if I'm not mistaken cannot be added to a model that shipped without a discrete GPU.
Eurocom MXM-to-PCIe x16 adapter lets you put a laptop GPU inside of a desktop PC that is a full size tower.
@DELL-Chris M would have more information.