Running PCIe Graphics Card on PCIe ?

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You're referring to NVME based M2 SSDs, correct? But yes if the SSD is PCIE spec then of course the speed will be less when used on PCIE

The answer to whether you can use a PCIe card in a slot is a resounding yes While the performance difference in this arrangement would Pci express version vs version , Gen 2 vs Gen 3 Is there any real performance loss

its bananas slot 2 NGFF to PCI-E 14 transfer card, using this adapter can convert ordinary PCI-E 1X interface to M 5 Slot B-Key SATA Base SSD PCI-e x2 pcie m2 sata  PCIe compatibility and performance generates a LOT of confusion In about 2 minutes we'll