Dell Precision 370 - Manual (Page 81)

1 retention tab
2 heat sink
3 retention base
NOTICE: If you are installing a processor upgrade kit from Dell, discard the original heat sink. If you are not installing
a processor upgrade kit from Dell, reuse the original heat sink and blower when you install your new processor.
3. Push down and out on the socket release lever.
4. Open the processor cover.