HP Netserver L Server series - Manual (Page 59)

Chapter 6 Installing an Additional Processor
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NOTE The heatsinks are not reusable unless the thermal patch has
been replaced each time the heatsink is removed, even if the
heatsink is just temporarily removed from a processor and then
re-installed on the same processor.
Each time the heatsink is moved (slide) on the processor, some
of the thermal material is removed from the thermal patch,
which could cause poor heat transfer and overheating.
3. Ensure the latches are free and pointing away from the heatsink.
4. Install the heatsink onto the processor in the following manner:
CAUTION To prevent scratching off some of the thermal material, don't
slide the heatsink around once it is on the processor. Rocking
it slightly to install both sides of the latch is acceptable.
a. Position the heatsink over the processor socket and lower it squarely onto
the processor, as shown in Figures 6-5 and 6-6.
The heatsink can only be installed in one direction, with the metal step to
the left of processor socket, as shown in Figures 6-5 and 6-6.