Even older 32-bit Atoms will handle 2D CAD OK. You don’t need rendering for 2D CAD, that’s what sucks the processing. I’ve used TurboCAD, SharkCAD and FreeCAD on a Cube iWork 10 flagship (z8350) for 3D and 2D work for a couple of years, not many of my models (3D) have more than fifty entities in an assembly but some of them range up over 150Mb file size and they’re still responsive – provided I’m not expecting real-time rendering while I’m manipulating. Those programs create 2D views and sections themselves from models, instead of the drafter having to do it. Styluses aren’t the greatest for CAD, mouse and keyboard (increasingly even voice input for parameters) are usually more productive because they give you instant access to zoom and pan, and orbit for 3D, and hot key/short cut access to tools, but pens can be useful for onsite sketch and edits.
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