I don't know about the i860, but accelerator cards for math-heavy workloads are still a thing, of course. I remember seeing a brochure for an add-on card with o

I don't know about the i860, but accelerator cards for math-heavy workloads are still a thing, of course. I remember seeing a brochure for an add-on card with one or two Cell CPUs, Intel has (had?) their Xeon Phi, and of course GPUs are very popular for things other than graphics. Intel, for better or worse, are a victim of their own success. On the plus side, their success gave them lots of money to throw at the problem of making faster x86 CPUs. It seems, though, that Intel is gradually running out of luck, with AMD and now Apple introducing strong competitors, and Intel's advantage in fabrication eroding. So CPU-/ISA-wise, things could get very interesting in the foreseeable future.