GTX 970 in PCIe x8 slot?

What does PCI x16 and x8 mean? It is a unit of speed, or is it a x8 slot as you have a Non G Processor that top slot should be running at full x16 speed the Top is coming Directly off the Last 4 PCI-E lanes go jackpot slot So now we are re-branding RTX xx50 series cards as xx60 series of cards with X8 PCIE gen4

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