Geared towards low noise computers, the Thermalright SI-128SE ships without a fan - but that doesn't mean it's intended to be used in an entirely passive manner. Rather, Thermalright expect you to install your own 120mm fan on the SI-128SE heatsink... call it BYOF. The SI-128SE cooler itself is big, a 120x120mm fin array hovering like SkyCity over a compact base connected via four 8mm diameter heatpipes.