After the last Spectre reveal I invested in the newest fastest hardware available that was immune, the stunning (hmm) Atom D2700. A screaming 2.1GHz dual core Atom with Hyperthreading - but with in-line execution and no speculation/branch prediction/out of order execution - and no management engine.
On its Zotac motherboard with a GT520 taking over from the awful graphics and an SSD with 4GB RAM to perk it up the thing actually runs 64-bit Windows 10 and is surprisingly fine to use - given that you don't try running anything too heavy to think about. It'll stream 1080p video from the web no problem for example.
Would have been interesting to see if anything could have been done with that core given some development resources. Still nice to try and get the most out of some underpowered kit just to see if it was viable.