The NM-A90 Upgrade-Kit for NH-U12P SE2 and NH-U9B SE2 CPU coolers makes it possible to install the heatsink turned by 90° on socket AM2/AM2+/AM3 AMD motherboards. Using the NM-A90 kit thus gives AMD users more flexibility in aligning the cooler with the airflow inside their case.Caution: The NM-A90 Upgrade-Kit is compatible with NH-U12P SE2 and NH-U9B SE2 coolers only.