Chapter 3: Setup and Installation
8.Place the heatsink on the processor then tighten two diagonal screws until snug, then the other two screws.
9.When all four screws are snug, tighten them all to secure the heatsink to the mainboard.
NOTE: Do not overtighten the screws as this may damage the processor or the heatsink.
10.Replace the cover on the blade unit and finish by installing the unit back into the blade enclosure.
Figure 3-3. Installing a Processor in a Socket
Gold dot
Socket key 
CPU key
CPU pin
Notched corner 
3-4 Onboard Battery Installation
A battery is included on the mainboard to supply certain volatile memory components with power when power has been removed from the blade module. If this battery dies, it must be replaced with an equivalent CR2032 Lithium 3V battery. Dispose of used batteries according to the manufacturer's instructions. See Figure
WARNING: There is a danger of explosion if the onboard battery is installed upside down, which reverses its polarities.