On the test bench today we have BeQuiet's Dark Rock 3 heatsink; the "little brother" to the dual-tower Dark Rock Pro 3 CPU cooler Frostytech recently put through the thermal wringer. The Dark Rock 3 stands 159mm tall and weighs in at 976 grams. Built around six, 6mm diameter copper heatpipes and a large aluminum fin stack, the Dark Rock 3 is rated to heat loads up to 190W TDP by the manufacturer.