But what about folks who want to give their 386DX system a speed boost with RapidCAD? Will they have to re-install their OS? :) https://www.youtube.com/watch?v=UM4NPh5qg8Y

But seriously this stuff is very subtle. An issue (probably different) from a HN thread on similar matters: https://news.ycombinator.com/item?id=30801836