11
Chapter 2 Hardware Setup
SB401-LB User's Manual
Step 5
Installing the heatsink on top of the processor.
(5a)
If present, remove the protective film covering the thermal interface
material on the bottom side of the heatsink (see letter A).
(5b)
Align the heatsink fins to the front and back of the chassis for correct
airflow. The airflow goes from front-to-back of the chassis (see letter B).
(5c)
Each heatsink has four captive fasteners and should be tightened
diagonally using the following procedure:
(5c-1) Using a #2 Phillips* screwdriver, start with screw 1 and engage
screw threads by giving it two rotations and stop (see letter C) (Do
not fully tighten).
(5c-2) Proceed to screw 2 and engage screw threads by giving it two
rotations and stop (see letter D). Similarly, engage screws 3 and 4.
(5c-3) Repeat steps C and D by giving each screw two rotations each time
until each screw is lightly tightened up to a maximum of 8 inch-lbs
torque (see letter E).
NOTE :
The processor heatsink for CPU1 and CPU2 is different. FXXCA91X91HS is
for CPU1, while FXXEA91X91HS2 is for CPU2. Mislocating the heatsink
will cause serious thermal damage.
C
Processo
r
Socket
AIRFLOW
Chassis Front
2
3
1
4
A
B
TIM
D
CAUTION:
Do not over-tighten fasteners.
E
