What are expansion cards and why are they needed?

case expansion slot width   Dan princess slot

Width: Thickness: Weight: Approx 186g Performance 128GB 256GB Supported expansion card: Up to 1TB Micro SD Available

PCI Express: The best type of expansion slot to have in your PC is the PCI Express, also written as PCIe · PCI: The PCI slot is the most common A slot graphics card is about 4 cm wide, slot is around cm wide, and cards have a width of around 5 cm Will , , and

football fever slot Width: about Thickness: about Weight: about 175g *Product size Protective Case ×1 Quick Guide ×1 Warranty Card ×1 Additional Remarks A The first slot is a regular PCIe slot with 16 lanes The third slot is physically an x16 slot, but only 4 lanes are connected