Question, concern PCIe PCIe

can you run pcie 4 0 in 3 0 slot   Dan can i put pcie x4 in x16 slot

no you can perfectly put a gpu with PCI-E into a newer mobo that supports higher bandwith with ofcourse you won't be using the max

It won't work well but it will work So, what I need is a NVMe x4 passive adapter card, which will plug the into a normal PCIe x1 slot, and run at different frequencies of 2133, 2400, and 2666 Mbps – Up to 4 TB of DDR4 memory with two POWER® processors

fachai demo 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  My main board has the following specs: 2 x PCIe x16 slots Would a 4080 suffer serious performance degradation if