Microsoft used Windows 8 as a guise under which to revamp the engine, and the results is a much faster system that consumes fewer resources than before. This makes it a better choice than Windows 7 for low-end PCs.
Read more: http://www.itpro.co.uk/desktop-software/21919/windows-81-vs-windows-7-which-is-best-for-you#ixzz3lJgzvlUR