This 8GB RAM is 100% compatible with Asus Z97-K/USB 3.1. For help in selecting the right RAM, we offer you faster 1600MHz memory for your system. Thanks to the backward compatibility of our RAM with 1333MHz, you can mix it with existing 1333MHz memory. ECC memory provides higher security through error detection and correction. The ECC function is supported if all existing memory is equipped with ECC. You should use UDIMM ECC RAM if existing memory is already ECC-equipped. It is possible to use different RAM sizes in the slots. Dual Channel Mode is also supported by Intel Flex Memory Technology. When using different RAM capacities, make sure that the memory in memory channel A is larger than the memory in memory channel B.