You're mixing up a bunch of things. Each wafer, which is the disk on which many dies are produced, is produced using a single technology process. This means th

You're mixing up a bunch of things. Each wafer, which is the disk on which many dies are produced, is produced using a single technology process. This means that Rome's IO dies (14nm process) are produced on separate wafers from the core dies (7nm process). The wafers are sliced into dies, the dies are tested and binned separately, and sufficiently good dies are then packaged together into a single package that goes into your server's CPU socket. The wavelength of the laser used for the manufacturing is a different story entirely. Pretty much all state-of-the-art photolithography uses 193nm wavelength lasers, and this has been the case for many years. Yes, the wavelength is larger than the size of the features produced with those lasers. There's a lot of magic involved. Since it's getting a bit too much magic, the industry has been trying to upgrade to 13.5nm (extreme ultraviolet) lasers for a long time. They're now starting to be used in actual practice. And EUV lasers are still basically magic, but of a different kind.