[aconz2]

Sounds cool. Does the DRAM exist both in the SPU (4 kelvin) area and 77 kelvin area? This paragraph is a bit confusing:

> We call it a superconductor processing unit (SPU), with embedded superconducting SRAM, DRAM memory stacks, and switches, all interconnected on silicon interposer ... Next, there is a glass bridge to a warmer area, a balmy 77 K that hosts the DRAM.

Having 20 exaflops in a 20x20x12 cm volume is cool, but aren't you going to need a memory bandwidth close (factor 10 - 1000 lets say depending on arithmetic intensity) to that to be useful? And total memory capacity as well. I feel like the bytes/second/area (bandwidth flux) would be the limiting factor to make use of that compute density

From the linked paper https://pubs.aip.org/aip/apl/article-abstract/122/18/182604/... the projected JSRAM density is 4MB/cm2 so barely anything on the SRAM front