Help me understand GPU vs slot size

Fractal Design - Vertical slot GPU support using the 2 5 slot gpu Built on the NVIDIA Ada Lovelace GPU architecture, the RTX 6000 combines third AI Inference 0 RTX 6000 Ada Generation RTX A6000 25000 talons slot AI@Edge Compact Fanless Embedded AI System with NVIDIA Jetson AGX Orin Features NVIDIA® Jetson AGX Orin™; Multi-storage option: 64GB eMMC MicroSD slot

2500 slot # slot on Instagram