Which is nice, but doesn't really answer my question?

There's a tremendous usability difference between "X flops and all the different types of cores can read and write to unified memory with cache coherence" (as on Apple Silicon) vs. "X flops but you need to carefully orchestrate chunks of data in and out of local scratchpad buffers" (as on the Cell).

This is a somewhat misleading metric, seeing how FP64 compute isn't a priority for consumer GPUs. Still, it's great to see that at least some facet of modern GPUs can be replicated independently without using an ridiculously oversized die. There may yet be hope for some new GPU startup.