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You can use a 16 core Ryzen 7950X and cap it at 65W to get 12% more performance than a 5950X. With the additional heatpipe you could do 105W TDP and get 31% more than a 5950X and only lose 5% compared to the stock 170W TDP. It has a GPU built in.

https://news.ycombinator.com/item?id=33231081

(edit) Maximum RAM depends on the Motherboard. My guess would be 64GB.

If you are talking about virtual cores (aka threads), then yes, such thing exists, it is called Compulab Airtop 3. You can order it with a Xeon E-2278GE, which has 8 cores | 16 threads | 4.70 GHz | 80W

https://fit-iot.com/web/product/airtop3-build-to-order/

Maybe https://news.ycombinator.com/item?id=33368511 ?