The Epiphany gains are certainly only achievable for massively pipelinable or embarrassingly parallel operations with very little intermediate state (e.g. strea

The Epiphany gains are certainly only achievable for massively pipelinable or embarrassingly parallel operations with very little intermediate state (e.g. streaming data, neural software, etc), not for random access large memory footprint crunching like the Xeon. There simply isn't the per-core memory (64KB), or external memory bandwidth, to go around otherwise. Xeon, Power, etc are kind of power pigs anyway, though they've got a lot of absolute oomph to show for it.