Intel Optane 900P AIC in a PCIE x16 slot

can i run a pcie 4 0 in 3 0 slot   Dan can i put a pcie 40 in a 30 slot

So, the PCIe or third-generation card will function when installed in a PCIe or second-generation slot as the PCIe standard is such that it is both

PCIe runs at 4GTs…its 4 gigatransfers per second and did not specify the bit rate at which binary data is being transferred For example, a PCIe Gen 4 is the latest and fastest PCIe standard available on motherboards and compatible CPUs PCIe Gen 4 cards can accommodate the full bandwidth that

cash-o-matic & touch slot If you use the first 2 PCIe slots you would limit them to 2 8x PCIe slots The CPU feeds those and the first slot all at PCIe There PCI-E versions are Backwards Compatable it will work all you may get is limited Bandwidth from your PCI-E Slot to your PCI-E Graphics