Howard Chu (hyc.delete@this.symas.com) on October 29, 2020 6:25 pm wrote:
> anonymou5 (no.delete@this.spam.com) on October 29, 2020 9:52 am wrote:
> > > The die size for an FPGA that can make good use of the IF bandwidth and do something
> > > worth replacing a CPU chiplet with is going to be a fair bit bigger than the CPU chiplet
> > > I think. The Rome package is already pretty full, so I think you'd probably need to
> > > sacrifice multiple chiplets, probably even half of them to make it work.
> > >
> > > It might be more practical, particularly in the short term to allow pairing a specially packaged
> > > FPGA with a normal CPU in a 2-socket system, using the FPGA transceivers to implement the inter-chip
> > > variant of Infinity Fabric and also supporting the existing DRAM slots. For the very short term
> > > you could also do PCIe between sockets as well, although then you loose cache coherencey.
> >
> > Past attempts by AMD and Intel weren't exactly stunning commercial successes.
> >
> > The term "solution looking for a problem" comes to mind, to be honest.
>
> Intel's Xeon 6138P probably didn't get much traction, but then again,
> it also cost 5x as much as the Xeon 6138 without integrated FPGA.

Posters above probably had in mind Arria2+Atom hybrid from 2010.
https://newsroom.intel.com/press-kits/intel-introduces-configurable-intel-atom-based-processor/#gs.jguw4v
According to my understanding, it was a failure.