Warning W239 - Cooling system thermal resistance is higher than recommended for this type of processor. Manufacturers recommend a certain performance for their thermal solutions (aka coolers) that is very important especially for very fast processors that generate a huge amount of heat (50W or more).
Fix: Check that the cooler is properly installed. Check interface material between cooler and CPU and consider using some high-performance interface material (e.g. Artic Silver). Check that the cooler is rated to support the processor you have installed at the speed it is running. If you have over-clocked the processor you may need a better cooling solution.
For more information, please see the (FAQ).