Help me understand GPU vs slot size

55mm GPU height for InWin A1 2 5 slot gpu CASE ACCESSORIES GPU LED Lights Expansions & Connectivity · POWER ATX Easily install a single RJ45 port via an available PCIe slot on your 25 bonus 25 slot Like a standard dual-slot GPU, a slot graphics card will require 2 free expansion slots in the rear of your case, but it will also fully

2525 slot Namely, that the RTX 5090 could be much slimmed down, and perhaps even be a two-slot graphics card