New graphics cards and motherboards that support the next-generation PCI Express 4.0 interface are coming soon. Today, I'd like to introduce you to the 3DMark PCI Express feature test, which will be ... 3DMark PCIe 4.0 test coming to 3DMark
There are some, like 8K video editing, and some specific compute scenarios but yeah, it's all pretty niche. Games are not limited even by PCIe 2.