Source paper linked is https://aisystemcodesign.github.io/papers/isca26/vistara_cam...

From a quick skim, you could think of this as roughly equivalent to shoving a large amount of DDR4 on a PCIe card and using it as a swap space. It's more sophisticated (see CXL protocol), but that gives you an idea of the tradeoffs. It seems there is some OS-level support for moving hot/cold pages between the main fast DRAM and the expansion higher latency DRAM.

It's a very valid point that DRAM has a fairly long lifetime and contains significant embedded carbon emissions, as well as the current availability crisis of new DRAM.

It is amazing how this is attributed to "zuck", like he actually knows these things.

> Why not go directly to the source article

Which seems to be the sister site of Register; https://www.blocksandfiles.com/architecture/2026/06/26/panmn...

The writers name is Maxwell Cooter, which made me giggle.