Don't know, but I would probably compare performance to benchmarks you can find online and if performance is as good as it should, it is likely fine as malfunctioning cooler would reduce performance.
Considering how expensive GPUs are nowadays, I keep my framerate capped in single-player games to something like 72-90 fps depending on game to reduce heat and stress to components, electric consumption and try to keep my GPU alive as long as possible. Capping fps also reduces noise from coolers a lot as GPUs are often quite efficient to a point and most of the heat and wasted electricity comes from pushing them to run as fast as possible to win benchmarks and improve sales.
Soon there will likely be other brands than AMD and Nvidia on GPU market (Intel, that Chinese company and who knows who else), but until then, prices are outrageous and I aim to keep mine running for as long as possible.