If you're looking to cram an incredible amount of horsepower into a small form factor build, like a Plexbox or DIY NAS, AMD is also rolling out a new Eco-Mode feature. This feature allows the processor to downshift from its rated TDP to the next lower 'grade,' meaning you can drop a 105W processor to 65W, or a 65W processor to 45W. AMD is making this feature available on all Ryzen models, and after the requisite firmware update, you can make the adjustments in either the BIOS or Ryzen Master.
AMD claims the 65W mode on the 3950X offers 77% of the chip's full performance, but at a 44% power savings that results in a 7C reduction in temperatures. The easy-to-use feature should prove very handy for SFF enthusiasts, though making a few manual adjustments to the power thresholds would provide many of the same benefits.