Many of the low power Intel Atom based motherboard use passive integrated heat-sinks for cooling. For more powerful processing applications, larger heat-sinks and active fansinks are required. We offer these heatsinks/fans in our configuration system, available at checkout.
Here are some examples.
Dynatron K199 1U active heatsink/blower fan for Core i3/i5/i7 and Xeon CPUs LGA 1155/1156
Build-a-Blade Support 