title: Why Atom is slow compared with its contemporaneous CPUs even with out-of-order execution?
body: <p>Why is Intel Atom slow even with out-of-order execution since Bay Trail? It has been improving, and now the performance is relatively sufficient for daily uses compared with the old in-order execution models. </p>
  
  <p>However, its speed is still much slower than its contemporaneous models with the same clock speed, especially in terms of single core performance(like the Pentium and Celeron processors with SNB/IVB/Haswell... cores, let alone the Core iX). </p>
  
  <p>What other reasons on the architecture caused the low performance? Considering the OOO has already been implemented.</p>