Arctic Accelero Hybrid 7970 Cooler Review @ OCC
 

The Hybrid ran at full speed the whole time, as any noise it made was not discernible from the rest of the system. Confident with the cooling headroom of the Hybrid, I pushed the overclock to the edge of stability at a blistering 1250 MHz core, 1950 MHz memory! Memory voltage was increased to 1.7 mV. Pushing further resulted in artifacts. Temperatures did not show an increase between the tested and maximum overclocks.

http://www.overclockersclub.com/revi...o_hybrid_7970/