You install a high-end RTX 4080 into the second slot of a mid-range motherboard. The card fits perfectly. But because that slot is wired for x4, you just choked your GPU’s bandwidth to 25% of its potential. Your frame rates will collapse.
High-end motherboards now let you install four separate NVMe drives on a single physical x16 slot, each getting its own dedicated lanes. This is a server feature trickling down to prosumer gear. But it only works if your motherboard supports "PCIe Bifurcation" in the BIOS. pcie slot width
It looks like a simple slot. But that little piece of plastic—and how long it is—holds the key to your computer’s speed, expandability, and future. You install a high-end RTX 4080 into the