Thermal Interface Material Application Pattern - Cisco UCS C240 M5 Installation And Service Manual

Replacing CPUs and Heatsinks
Note The heatsink must have new TIM on the heatsink-to-CPU surface to ensure proper cooling and performance.
• If you are installing a new heatsink, it is shipped with a pre-applied pad of TIM. Go to step 5.
• If you are reusing a heatsink, you must remove the old TIM from the heatsink and then apply new TIM to the CPU
surface from the supplied syringe. Continue with step a below.
a) Apply the cleaning solution that is included with the heatsink cleaning kit (UCSX-HSCK=) to the old TIM on the
heatsink and let it soak for a least 15 seconds.
b) Wipe all of the TIM off the heatsink using the soft cloth that is included with the heatsink cleaning kit. Be careful to
avoid scratching the heatsink surface.
c) Using the syringe of TIM provided with the new CPU (UCS-CPU-TIM=), apply 4 cubic centimeters of thermal
interface material to the top of the CPU. Use the pattern shown below to ensure even coverage.
Figure 32: Thermal Interface Material Application Pattern
Step 5 Use only the correct heatsink for your CPUs to ensure proper cooling. There are two different heatsinks:
Note
UCSC-HS-C240M5 for standard-performance CPUs 150 W and less; UCSC-HS2-C240M5 for high-performance
CPUs above 150 W. Note the wattage described on the heatsink label.
With the CPU assembly on the CPU assembly tool, set the heatsink onto the CPU assembly. Note the Pin 1 alignment
features for correct orientation. Push down gently until you hear the corner clips of the CPU carrier click onto the heatsink
corners.
In the following step, use extreme care to avoid touching or damaging the CPU contacts or the CPU socket
Caution
pins.
Step 6 Install the CPU/heatsink assembly to the server:
a) Lift the heatsink with attached CPU assembly from the CPU assembly tool.
b) Align the assembly over the CPU socket on the motherboard.
Cisco UCS C240 M5 Server Installation and Service Guide
78
Maintaining the Server