Asus KFSN4-DRE/SAS - Manual (Page 32)

2-12 Chapter 2: Hardware information
2.3.2 Installing the heatsink
The AMD Opteron™ 2000 series processors require a specially designed heatsink
to ensure optimum thermal condition and performance.
Make sure that you use only qualified heatsink assembly.
Follow these steps to install the CPU heatsink.
1. Place the heatsink on top of the
installed CPU, making sure that the
screw holes are matched with the
heatsink standoffs.
2. Secure the heatsink with two
screws.
Make sure that the heatsink is
not skewed or tilted otherwise,
the CPU will overheat.
3. If you installed a second processor,
repeat steps 1-2 to install the
second heatsink.