Mac Pro 5,1 GPU in PCIe slot 2 - does it

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The Asus GeForce RTX 4060 Ti 8GB Dual OC + SSD Expansion slot does what it says on the

From what I gathered in my motherboard's manual, both PCI 1 and PCI 3 slots are PCIe x16 slots, which seems to match my GPU However, in The Matrox PCI and PCIe technology guide explores the importance of evaluating different slot types when buying add-in graphics cards

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