What problem is faced by multicore processors running older software written for single-brain chips? Multicore processors usually run older software by using only one core at a time. Multicore processors draw more power than single-brain processors to solve the same problem. Multicore processors require greater cooling to run the same software as single-brain processors. Individual cores in multicore processors have smaller memories than single-brain chips and are consequently slower. Multicore processors are tougher to design and more expensive to manufacture, as compared to single-brain chips.