User's Guide

1. Installing Internal Optional Devices
Express5800/R120d-1E User’s Guide
55
Chapter 2 Preparations
11. Make sure that the heat sink is installed on a level with the motherboard.
Note
 If the heat sink is not level, remove it, and then install it again.
The following probably causes the heat sink not to be level:
– The CPU is not positioned correctly.
– All screws are not completely tightened.
 Do not move the secured heat sink.
12. Install the additional fan units provided with additional CPU. Remove three dummy covers from the slots
where you are going to install additional fan units.
13. Install three fan units in fan cage, and connect the fan cable with connector on motherboard.