Even a modest Dyson cloud built with, say, the matter in two useless planets, Mercury and Venus, would provide so much energy it could power a few quintillion Raspberry Pi-sized processors for literal ages. This is why there are no interstellar species: what’s the point in expanding away from a star that provides all the energy needs you and your digital descendants will ever require? Even when the star becomes senescent, all you have to do is move the cloud outwards until the star finally goes nova–at which point you just move the cloud to the nearest convenient star.
