The Rosewill RCX-Z2 Heatsink has a very odd overall shape with fasteners that look a bit like landing gear as well as a glowing blue fan.  If it is run on a motherboard without PWM, the full 59dBA adds to the overall impression of some sort of alien craft landing.  Frosty Tech gave it a try on their test bench, and you can find out how well it did here.
“The Rosewill RCX-Z2 heatsink is designed for socket 775 Intel Pentium D and Core 2 Duo processors. Pulse Width Modulation compatible fans are noted by their 4-pin power connectors, and what PWM does is enable the BIOS to directly control fan speed. The impeller speed increases or decreases relative to the processor’s temperature at any given moment, in this case between 500RPM and 3400RPM.”

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