There are only a couple websites that do really good heatsinks reviews, and FrostyTech.com is one of 'em. It's no surprise then when the boys at Frosty dish out the thermal data on one of Fatal1ty's heatsinks - the jumbo all copper Zalman FS-C77.

"The Zalman Fatal1ty FS-C77 heatsink is the Zalman CNPS7700-Cu heatsink with a coat of red lacquer applied and a slightly beefier 120mm red LED illuminated fan. The two heatsinks are compatible with the same variety of processors, but the CNPS7700-Cu is skewed for silent running while the FS-C77 ships without the Fanmate 2 fan speed controller. Apart from these three differences, the two heatsinks are identical in every other way. The Zalman Fatal1ty FS-C77 is a large cooler by any measure, and unlike every other Zalman heatsink this one is entirely tuned for performance. It's translucent 120mm fan rotates at 2400RPM, and a series of red LEDs light up the blades nicely in a darkened case."