PCIe x4 vs x16 for single NVMe SSD speed increase?

pcie x4 in x16 slot
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It'll have all 16 if you don't use the second slot but it makes no difference Even a 1080 shows no performance difference at x8

Two types of PCIe slot on an Asus H81M-K motherboard Various slots on a computer motherboard, from top to bottom: PCI Express x4; PCI Express x16; PCI Express

pcie slot x16 1 PCIe x16 slot; 4 SATA3, 2 x ; Graphics Output Options: HDMI & Display ; 1 Rear USB Gen2x2 Type-C, 1 Rear USB Gen2 Type-A

pcie expansion slot The package also includes a two-slot expansion backplane and a PCIe x4 2-meter cable Plug the x4 host adapter card into an