It's my understanding from friends in the business that the actual chips do not represent any capacity issue or bottleneck, it's actually manufacturing the devices that the chips are in (e.g. the finished graphics card).
Take a look at a recent GPU and count the auxiliary components. All of them can cause supply chain difficulties.
For a science project, we need to manufacture magnets. It's not easy to find a company who has the right iron right now, and it's hard to get, with long lead times. The supply crisis is real.