Fujitsu PRIMERGY RX2540 M7 Upgrade And Maintenance Manual page 356

Processor (CPU)
Installing the heat sink
Figure 216: Marks on heat sink and CPU frame
▶ If applicable, remove the protective cover from the heat sink.
▶ If using a heat sink again, clean residual thermal paste from the heat sink
surface using a lint-free cloth.
▶ Ensure that the triangle marks on the heat sink and on CPU frame are on
the same edge (see circles).
356 Upgrade and Maintenance Manual RX2540 M7