A method for operating a cache that includes both robust cells and standard cells may include receiving a data to be written to the cache, determining whether a type of the data is unmodified data or modified data, and writing the data to robust cells or standard cells as a function of the type of the data. A processor includes a core that includes a cache including both robust cells and standard cells for receiving data, wherein the data is written to robust cells or standard cells as a function of whether a type of the data is determined to be unmodified data or modified data.