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 only DDR3 memories up to 1,333 MHz under dual-channel architecture, but ASUS says the P8Z68-V PRO supports memory up to 2,200 MHz through overclocking.
The ASUS P8Z68-V PRO has four memory sockets, and since DDR3 memory modules can now be found in capacities up to 8 GB, you can have up to 32 GB with this motherboard if you use four 8 GB modules.
The first and third sockets are blue, while the second and fourth are black. In order to achieve the maximum performance, you should install two or four memory modules in order to enable dual-channel architecture. When only two modules are used, install them in the blue sockets. Otherwise, your computer won’t turn on.
As it occurs with other motherboards from ASUS, the P8Z68-V PRO comes with the “MemOK!” button, which allows you to test the compatibility of the memory modules that are installed.