There's also digital probabilistic computing, with a processor working on AWS, and for the right workload ,claimed to be offering a very significant speed boost:

https://www.eetimes.com/probabilistic-computing-is-already-h...

Towards the end of the article.

Also, there is a tiny version in microSD format:

https://www.mouser.ie/en/ProductDetail/Signaloid/S-C0-00-1D?...