dual slot gpu - Era ITX — Fractal Design ok 888 slot login

Supports dual slot graphics cards up to 295 mm in length. ... 2x 140 mm (without 2-slot GPU).

The NVIDIA RTX A2000 12GB brings the power of RTX to more professionals with a powerful low-profile, dual-slot GPU design, delivering real-time ray tracing ...

what is a gpu dual slot? is there also a single slot gpu, if so what are the differences? ... A dual slot would cover the other one and the single slot would not cover it.