PC Building Simulator
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PC BUILDING SIMULATOR Its website here - Download demo here

Someone had to do it
Although still in a very basic state, this "game" promises. The idea is to build a PC with real components and real interactions from a given budget. As far as the game is concerned, as its author says, the proposal is based on knowing what to do and what goes where.
In the demo, the capabilities are tremendously limited, but the author plans that actions such as managing wiring, hardware, simulating ventilation, etc., can be carried out.
As with any personal (or "indie" which sounds more modern) proposal, the initiative may end in failure. There are many pending issues not only of development, but also of continuity (updating components and prices) and a great potential that will require many hours of work (calculating power consumption, simulating temperatures, component incompatibility), but if it moves forward I don't think it will be very entertaining as a game, but as a configuration tool it could be a hit.
on Youtube

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It would be amazing if air flow and temperature gradients were simulated with the case closed based on the installed components and load. But being in their infancy, they are still on time.
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@cobito that I think is too advanced, hehe, but it's very curious

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@Bm4n Considering that the most widely used fluid simulators cost thousands of euros, perhaps yes. But don't let that stop you from dreaming.