Intel socket LGA1155 CPUs have an embedded memory controller, meaning that it is the processor, not the chipset, that defines what memory technologies and the maximum amount of memory you can have. The motherboard, however, may have a limitation as to how much memory can be installed.
The integrated memory controller from socket LGA1155 processors supports DDR3 memories up to 1,333 MHz under dual-channel architecture, but Zotac says the Z68-ITX WiFi supports memory up to 2,133 MHz through overclocking.
The Zotac Z68-ITX WiFi has two memory sockets, and since DDR3 memory modules can now be found in capacities up to 8 GB, you can have up to 16 GB with this motherboard if you use two 8 GB modules.
Since there are only two memory sockets, you must install two memory modules in order to enable the dual-channel feature. If you use only one memory module, the system performance won’t be the best.