The Intel Atom x5 Z8300 is based on Cherry Trail 14 nm platform featuring quad cores and 2 MB of level 2 cache.
The Intel Atom x7 Z8700 is fastest of the new Atom x7 CPU units with stronger CPU; support for maximum of 8GB RAM and three displays. It is aimed at mainstream tablets.
The Intel Atom x5 Z8500 is manufactured using 14 nm process. Unlike the Z8300, it supports maximum of 8GB RAM instead of 2GB. Also it supports maximum of three displays.