a wintel machine running native x86 apps relatively efficiently
or a arm box running windows native on a x86 emulator slowly
Most low-end Windows PCs use Atom / Celeron / Pentium / AMD A-series CPUs, and their performance is similar to the Qualcomm ARM emulating x86. For example, my 2+ year old N2840 netbook is slower at both single and multicore Geekbench according to http://cpuboss.com/cpu/Intel-Celeron-N2840
So it looks like the low-end x86 market is under threat. I would include games consoles in that.