Looks like it will fit.  Tower PCI-e dimensions screengrabbed are from the Precision 7920 Tech Guide.  RTX 3080 dimensions are screengrabbed from Google. I suggest measuring the width you have to be sure.  While the tower is obviously wider than the card, the tech guide doesn't mention internal width for PCI-e slots.  I don't want to automatically say "yes" to find out some door handle is in the way. Screengrabs below: [IMAGE] [IMAGE]  
Hello, I want to install a geforce 3080 on a precision 7920 tower. Can you tell me if this graphics card can be mounted on this type of tower? indeed, for photogrammetry an RTX3080 seems much more efficient than a Quadro RTX5000. Thanks in advance,
Geforce RTX3080 on a precision 7920