What is the difference between PCIe Gen 3 and PCIe Gen 4?

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For example, in the above image , the top x16 PCIe slot is both x16 in length as well as x16 electrically, meaning it'll run

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2 slot watch box I have a dual-slot graphics card in that particular slot Since yours is a triple slot, then yes, it will cover the USB As far as overhead, it