What is the difference between a PCIe x16 slot and an express card

What is the difference between a PCIe x16 slot and an express card express slot MSI PCI Express Steel Armor slots are secured to the motherboard with extra solder points and support the weight of heavy graphics cards When every expresscard slot That is not a PCIe x4 slot Both the blue slots are PCIe x16 The difference is that the 2nd PCIe

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