American Megatrends Atlas PCI-II User Manual page 22

Step 4 Install CPU,
Install the Heat Sink If the heat sink is not already installed on the CPU module, slide the
heat sink top support into the lowest gap on the CPU module, as shown
below:
The slide the CPU module into the Retention Mechanism Assembly, as shown
below:
18 Atlantis PCI Pentium II ISA Motherboard User's Guide
Continued
Cont'd