RTX 3060 PCIe vs PCIe - is there a Difference?

RTX 3060 PCIe vs PCIe - is there a Difference? can i run a pcie 4 0 in 3 0 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 can i use gen 4 ssd on gen 3 slot Like USB, PCIe is forward compatible This means that a device which requires PCIe will work in a PCIe or PCIe slot Slot Size Lane Width

can i use gen 4 ssd on gen 3 slot According to the spec sheet it does supports PCie 1 x PCIe x16 slot Source: Link above

candy boom slot The board has one PCIe slot but the slots are PCIe You can still use the PCIe SSD in the PCIe NVMe slot but max speeds will  It's not a question of efficiency ( whether or not it's justifiable to use expensive card designed for 16x PCIe in 4x slot of PCIe