Specifications

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3-20
Cisco UCS C460 Server Installation and Service Guide
OL-22326-01
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
Replacing CPUs and Heatsinks
This server can operate with 2-, 3-, or 4-CPU configurations. Each CPU supports two memory risers
(four memory buffers) connected by serial memory interface (SMI). Each memory buffer has two DDR3
memory bus interfaces.
Note The minimum CPU configuration is that CPU1 and CPU3 must be installed. See Figure 3-13, which has
a view shown facing the front of the server. Only CPU1 and CPU3 are connected to the internal PCIe
hub. With CPU1 and CPU3 installed, any other combination operates.
Figure 3-13 CPUs and Memory Risers
To install or replace a CPU heatsink and CPU, follow these steps:
Step 1 Remove the CPU and heatsink that you are replacing:
a. Power off the server as described in the “Shutting Down and Powering Off the Server” section on
page 3-6.
b. Slide the server out the front of the rack far enough so that you can remove the top cover.
Note You might have to detach cables from the rear panel to provide clearance.
Caution If you cannot safely view and access the component, remove the server from the rack.
c. Remove the top cover as described in “Removing and Replacing the Server Top Cover” section on
page 3-7.
d. Remove all memory risers to uncover the CPU cage screws. See Replacing Memory Risers,
page 3-23.
e. Remove all the memory riser dividers by lifting them straight up and sliding them free of the CPU
cage. See
Figure 3-14.
f. Remove the CPU cage by loosening the six captive screws that secure the cage to the motherboard.
See
Figure 3-14 for the screw locations.
g. Loosen the two captive screws that secure the heatsink and lift it off of the CPU. See Figure 3-14
and Figure 3-15.
Note Alternate loosening each screw evenly to avoid damaging the heatsink or CPU.
h. Unclip the CPU retaining lever and lift the CPU retaining lid. See Figure 3-15.
i. Lift the CPU out of the socket and set it aside on an antistatic mat or in an antistatic bag.
CPU 4 CPU 3 CPU 2 CPU 1
MEM 8 MEM 7 MEM 6 MEM 5 MEM 4 MEM 3 MEM 2 MEM 1