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Cisco UCS C24 Server Installation and Service Guide
OL-26647-01
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
Note Before installing DIMMs, refer to the population guidelines. See Memory Performance
Guidelines and Population Rules, page 3-20.
a. Align the new DIMM with the empty slot on the motherboard. Use the alignment key in the DIMM
slot to correctly orient the notch on the bottom edge of the DIMM.
b. Push down evenly on the top corners of the DIMM until it is fully seated and the ejector levers on
both ends lock into place.
c. Replace the plastic air baffle over the DIMM slots.
d. Replace PCIe riser 1 to it slot. See Replacing a PCIe Riser, page 3-32.
e. Replace the top cover.
f. Replace the server in the rack, replace cables, and then power on the server by pressing the Power
button.
Replacing CPUs and Heatsinks
This server can have up to two CPUs. Each CPU supports three DIMM channels (six DIMM slots). See
Figure 3-12. This section includes the following topics:
• Single-CPU Restrictions, page 3-24
• CPU Replacement Procedure, page 3-24
Single-CPU Restrictions
The minimum configuration is that the server must have at least CPU1 installed. Install CPU1 first, then
CPU2.
The following restrictions apply when using a single-CPU configuration:
• The maximum number of DIMMs is six (only the six slots controlled by CPU1 are active).
• PCIe riser 2 is unavailable (PCIe slots 3, 4, and 5).
CPU Replacement Procedure
Caution CPUs and their motherboard sockets are fragile and must be handled with care to avoid damaging pins
during installation. The CPUs must be installed with heatsinks and their thermal pads to ensure proper
cooling. Failure to install a CPU correctly might result in damage to the server.
Caution The Pick-and-Place tools used in this procedure are required to prevent damage to the contact pins
between the motherboard and the CPU. Do not attempt this procedure without the required tools, which
are included with each CPU option kit. If you do not have the tool, you can order a spare (Cisco PID
UCS-CPU-EN-PNP).