GPUs aren't quite the same, because they're (mostly) SIMD. GPUs don't have the independent per-compute-core memory bandwidth required for every core to be runni

GPUs aren't quite the same, because they're (mostly) SIMD. GPUs don't have the independent per-compute-core memory bandwidth required for every core to be running its own execution thread with an independent instruction pointer, independent data fetches, and (especially) non-correlated branch-prediction failures / cache misses. (This is most of the reason that branching, if even implemented in the GPU's ISA, is effectively useless.) Whereas, what the parent poster is describing would be true MIMD: a bunch of tiny cores each with its own on-board RAM, its own instruction pointer, and then a bus (or a bunch of busses) fast enough to feed them all data from (probably NUMA) main memory. GPUs don't provide any advantage for running e.g. a high-concurrency Erlang application server. But a true-MIMD system would.