Operating computer memory in a computer including dynamically monitoring, by a predictive failure analysis module, correctable memory errors and memory temperature and managing cooling resources in the computer in dependence upon the correctable memory errors and memory temperature. The BIST control unit is coupled to a plurality of comparator units. The internal write command latch releases the latched write command in response to the write command latch signal after a latency delay. The ring bead comprises outer faces, which are supported on radially extending ribs of a housing receiving the filter element or on a flat surface having channels. By selecting the radiation nature, its energy and the irradiation parameters a structure can be created in the bulk of the material leaving the surface essentially untouched.