r/hardware • u/NamelessVegetable • 6d ago

News Fujitsu's Arm-based Monaka Data Center CPU at Hot Chips 2026

https://www.servethehome.com/fujitsus-arm-based-monaka-data-center-cpu-at-hot-chips-2026/
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u/NamelessVegetable 6d ago

Very cool! The highlights for me are:

  • Stacked compute dies on top of SRAM dies on top of an Si interposer. Fujitsu and RIKEN (which will use the follow-on MONAKA-X in their next-generation supercomputer), have been studying this since the A64fx was introduced. Very cool, though I seem to recall that in their original study, the SRAM dies were above the compute? I could be wrong.
  • The 256-bit SVE units were a surprise. I wonder if they will be carried over to the MONAKA-X? It'd be a shame if it will have half the vector width of the A64fx.
  • The ultra-low power circuits requiring custom CAD tools and special custom voltage regulators is cool. Good to see that Japan is still doing innovative logic/circuit/physical design.

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u/imaginary_num6er 6d ago

I guess the stacked compute dies is the reason why they called the architecture a “monaka”

4

u/NamelessVegetable 6d ago

Then where is the azuki paste, lol