According to a comment on https://news.ycombinator.com/item?id=31985142
The first benchmarks indicated the plain Archimedes had higher FP throughput than a 16MHz 386 with a 387.
The original Archimedes had an 8 MHz ARM-1 (no FPU). I would expect that to be roughly in the ballpark of a 16 MHz 386 for integer performance, might be a bit faster or slower depending on the benchmark. But I would expect it to fall well short of a 16 MHz 387 for floating point. An FPU is supposed to make FP run much faster; that's the whole point of having it! So the claim of higher throughput for the Archimedes is quite extraordinary.
Is there any substance behind that claim, or did something just get garbled along the way?