Another recent primer on in-memory / near-memory computing in [1]. Upmem [2] is also selling memory with on-board compute. A space that is slowly hotting up!

[1] O. Mutlu, S. Ghose, J. Gomez-Luna, R. Ausavarungnirun, A Modern Primer on Processing in Memory. https://arxiv.org/abs/2012.03112

[2] https://www.upmem.com/

Transport uncached 32 bits from RAM: 650 pJ

32 bit multiplication : 3 pJ [1]

The energy savings come from not transporting data.

[1] http://www.sigmod2014.org/damon/slides/picojoule.kozyrakis.p...

A relevant paper from '19 (Behind paywall) -

https://ieeexplore.ieee.org/document/9073325

Edit:

A more accessible (in both senses) survey paper on Near-Memory Computing:

https://arxiv.org/abs/1908.02640.pdf

> Behind paywall

Tip: if you contact the author(s) of a paper that is of interest to you and ask for a version of it, there's a good chance that they'll gladly accommodate. I think generally authors don't even have any financial benefit if you pay for the paper (it all goes to the publisher).

Thanks

(obligatory scihub reference)