computer case expansion slots
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DeepCool CH260 Micro-ATX Computer Case, Up to 360mm Radiator, Up to 6x 120mm Fan Support, 4x Expansion Slots, Tempered Glass Side Panel, Wraparound Mesh Panels, White | R-CH260-WHNGM0-G-1 model CH260 WH Computer Cases
Can You SLI Two Different GPUs? - PC Guide 101
The slot type of your GPU might also be important if your case is small (perhaps when building a mini ITX computer) and it has limited rear expansion slots ...
Motherboard Ports: What They Are and How They Work - Lifewire
The purpose of expansion slots is to provide a standardized connection interface that allows expansion cards to communicate with the rest of the computer system.