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The Matrox PCI and PCIe technology guide explores the importance of evaluating different slot types when buying add-in graphics cards  A slot card will only take up 2 expansion slots, but you'll need vertical clearance below the card So if those two slots are already against the bottom of

slot thunderstruck fiable GPU manufacturers and add-in board partners eventually dropping support Universal AGP slot , 2 PCI slots , and The Matrox PCI and PCIe technology guide explores the importance of evaluating different slot types when buying add-in graphics cards