On the test bench today we have BeQuiet's Dark Rock TF heatsink - a top-down dual tower heatsink which features a pair of BeQuiet SilentWings fans and stands 130mm tall. The Dark Rock TF heatsink is built around six 6mm diameter heatpipes which link a large primary aluminum fin stack and smaller secondary set of aluminum cooling fins to a chunky copper heatspreader below. The 135mm PWM fans are arranged in a push-pull configuration, exhausting downwards so related motherboard CPU VRM components benefit from the cooling air flow.