A quantum CPU could be a good way to get way more power out of a modern PC. Games and applications are becoming more and more demanding, as well as websites that run bitcoin miners in the background like Piratebay. But operating systems and applications would need to be completely rewritten to work on a completely different CPU architecture. Unless the CPU could incorporate an emulation layer that would allow running X86 operating systems on a new quantum CPU. The only problem at the moment is the need to cool the CPU to -273 degrees Celsius. This is absolute zero. This requires power and makes a solution like this very expensive to build and run. Room temperature superconductors would be a good solution for a CPU and GPU, they would not get hot as they are not offering any resistance to the flow of current through them, and therefore, they would not need a fan running all of the time to cool them down. This would be very good for a machine running intensive operations, it could still be very quiet. There is a patent for a room temperature superconductor, but I will wait and see if it actually works in practice.
it would be a revolution for computer builders, but retailers of computer cooling technology would go out of business if it could be implemented in a CPU. Imagine a super powerful GPU that does not get hot. This would allow thinner wires to carry the same amount of current to work a CPU, allowing more densely packed components and possibly putting 2 CPU`s in one package, without worrying about the heat generated by the components. Stacking more cores into a CPU and then increasing the amount of things it can do at once would be great. But a GPU has mostly taken over from a CPU unless it is an old game like Arma 3 that still uses the CPU a lot due to the single-threaded engine. But a multi-threaded game engine would benefit from many CPU cores when running in an intensive multiplayer environment. That is one big problem with gamers demanding more performance, the game engine must be built from the ground up to be multi-threaded, then the performance will further increase. If it is an outdated engine like RV4, then there is not much you can do. If the developers have not used one thread for the AI and another for the game logic.