Summary: The Coolermaster Hyper 612 PWM heatsink stands 163mm tall and weighs a pretty hefty 806 grams. The cooler is compatible with Intel socket 775/1155/1156 and LGA1366 processors, but crucially not LGA2011 Sandy Bridge-E CPUs. AMD socket AM2/AM3/FM1 processors are supported.
The Cooler Master Hyper 612 PWM is a very large CPU cooler. Adding a second fan, while decreasing your temperatures, will make the cooler much larger and may even cause some clearance issues.