VR Zone gives this HSF 85%:
The Kama Cross is definitely a contender in the heatsink market even though it's price point doesnt reflect it as a performance cooler, but do note that you might have to put up with slightly higher system temperatures and perhaps, more noise if you intend to use it for your overclocked PC. Otherwise, the Kama Cross makes a perfect low noise cooler too, just swap the fan out for one of Scythe's S-Flex Sony fans!