Graphics is very parallel, and so not that affected by a single-core performance plateau. We can keep increasing number of gpu cores.
The easily parallelisable nature of graphics means you can always make a faster GPU with more cores. The trouble is, newer nodes aren't reducing power usage per transistor very much, so all the newer GPUs just have a ton more silicon, and therefore much higher power requirements.
RTX 4090: 2235 MHz base, 2520 MHz boost