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Cisco UCS Cisco UCS C220 M4 High-Density Rack Server (Large Form Factor Disk Drive Model)
SUPPLEMENTAL MATERIAL
73
Adding an Additional CPU (with CPU heat sink) or Replacing CPUs
All Cisco UCS two CPU socket-capable servers can be upgraded from having one to having two CPUs 
configured or can also support replacement of the CPUs. You will need to order and install a heat sink when 
adding any additional CPU to a server. Instructions for installing the new CPU or replacing CPUs and heat 
sink can be found at the following link:
See the section titled “Replacing CPUs and Heatsinks.”
Motherboard Lithium Battery
You can order a replacement motherboard battery. Installation instructions are found at this link:
See the section titled “Replacing the Motherboard RTC Battery.”
Thermal Grease (with syringe applicator) for CPU to Heatsink Seal
Thermal grease must be applied to the top of the CPU where it comes in contact with the heat sink. (a 
grease syringe also ships with each CPU spare option kit). Instructions for applying thermal grease are found 
at:
See the section titled “Replacing CPUs and Heatsinks.”
NOTE:  Unlike previous generation servers, the C220 M4 has tool-less CPU sockets, so 
no separate tools (such as “pick n place” tools) are required to add or replace CPUs.
CAUTION:  Use only the thermal grease specified for this server 
(UCS-CPU-GREASE3=). This thermal grease comes in a white-tipped 
syringe and is to be used only in the C220 M4 and C240 M4 servers. Other 
servers use thermal grease in a blue-tipped syringe (UCS-CPU-GREASE=). 
 
 
Thermal grease for other systems may have different thermal 
conductivity properties and may cause overheating if used in the C220 M4 
or C240 M4 servers. 
 
 
DO NOT use thermal grease available for purchase at any commercial 
electronics store. If these instructions are not followed, the CPU may 
overheat and be destroyed.