Difference between double slottriple slot graphics card?

I have a 1080Ti in a SFF case Thinking about upgrading GPU, but am constrained by needing a true double slot card So many filters for 2 slot

Uncompromised GPU Support Designed to Supported GPUs up to 4 slots, 343mm in length, 152mm in width ; Breathes Easy, Performs Great Breathable, mesh panels

22 slot Scalable parallel computing GPU dense servers that are built for high performance 2 GPU 4 GPU 8 GPU The first PCIe x4 Slot supports the latest

20 mega slot This part is only included in the Sandwich Kit Two threaded holes are added to support more PCIe Riser Cables Updates: Improved GPU support up to 140 x