GPU not working in PCI_E1 slot on MAG B650 Tomahawk wifi

gpu expansion slot   Dan gpu stuck in pcie slot

It should work in PCIe_1 out of the box, as that's the primary slot in pretty much all consumer motherboard for a graphics card I would suggest

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free slot with bonus Installing a New GPU Once you're ready to install your GPU, turn off your PC, unplug it, open your case, and disconnect your current graphics card Make sure A PCIe card, also known as a PCI Express card, is an expansion card that connects to a computer's motherboard using a PCIe slot Graphics Card ; Network