“Cray” Clock speed (Mhz), no. of processors, peak power (Mflops)
Here is the history of Cray machines as measured by floating-point performance, number of processors, and clock speed (or circuitry).
The purple squares show the number of processors per computer.
Blue diamonds show clock speeds in Mhz that were approaching a gigahertz.
The Xs show the aggregate megaflops. In the last ten years all of the performance has come by adding more parallelism to the processors.
I’ve added the last machine that he was working on at SRC Company - it’s in the Teraflops range and its several hundred commodity CMOS microprocessors access a common memory via a large, cross-point memory.