We’ve tested with the included PWM cooling fans to show the performance available out of the box but now it’s time to see how the heatsink design holds up to testing without the assistance of a cooling fan. This test relies purely on design and quality components. As you can see from the results, Dark Rock Pro 2 narrowly pushes past our current victor – Silver Arrow SB-E Extreme and confidently affirms itself as the best heatsink we have yet tested, proving that without the cooling fans the materials and design offer the best cooling efficiency.