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I think they're actually asking, if you have a single "thread" of a GPU, is that one thread quicker at math than a single thread of a CPU? The most fair comparison imo might be a single "warp" in nvidia terms against a single CPU thread, which is roughly similar to what a CPU might be doing for AVX.

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It’s much slower. GPU single thread performance is very slow. Unless you are doing some specialized operation that has a special instruction on GPU, it will be slower.

GPU clock speeds are lower in general and the CPU has a much wider super scalar pipeline. Can be 4-8 wide vs single or double wide for most GPUs. It also has many latency-hiding techniques for a single thread. The GPU has none, it uses multiple threads to hide latency.

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