There are many 7-inch and 8-inch tablet in the market, such as the iPad Mini and Google Nexus 7 devices, so Windows 8.1 OS bring a key feature to support for cheaper devices with smaller screen.
As I knwo, all Windows 8 system form factors require the minimum resolution of 1280 X 800 at a depth of 32 bits. Now Microsoft reduces the minimum resolution requirement of Windows 8.1 to be 1024 x 768. With the change, OEM partners will develop more cheaper and smaller form factor devices.
For Examples, let’s test on an 8-inch Acer Iconia W3 tablet which comes with a low-resolution display. Windows 8 disables the snap feature, so you can’t view two apps side by side simultaneously. That is disappointment. However, running Windows 8.1 preview drives 1024 x 768 display well and you are able to employ the new 50/50 side-by-side snap view. Another improved is the capacity of run applications in portrait orientation, like Kindle.