The Cray PVP line was also doing double precision floating point, and could overlap vector memory operations with math operations. My guess is that you would need a microcontroller operating at several hundred MHz to beat a Cray-1 in practice. The later Cray-1/S and /M variants also supported a 10gbps link to an SSD of several hundred megabytes, which is hard to beat in a microcontroller.
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