We ordered 2 x Intel core i5 machines with Windows 8 Pro and were supplied with corei7 units which was very nice and in general the 2 machines work as we would expect. BUT, We had ordered Window 8 Pro for both PCs but one came with Windows 8 only. It took nearly a month to get an upgrade from the supplier and Dell but it was not the W8.Pro version which after desperation, we ended buying the W8.Pro upgrade online. The problem we now have is that the drivers that were installed and are required for the external different monitors we have just do not work on one Dell XPS machines. All very inconvenient and time wasting for everyone. We would probably never buy another Dell PC again after this. Products advertised on Amazon # Not what we received !!