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Maintaining the Server
• The minimum configuration is that the server must have at least CPU module 1 installed in the lower
• The maximum combined memory allowed in the 12 DIMM slots controlled by any one CPU is 768 GB.
• The following restrictions apply when using only a two-CPU configuration (CPU module 2 is not present):
Tools Required For CPU Replacement
You need the following tools and equipment for this procedure:
• T-30 Torx driver—Supplied with replacement CPU.
• #1 flat-head screwdriver—Supplied with replacement CPU.
• CPU assembly tool—Supplied with replacement CPU. Orderable separately as Cisco PID UCS-CPUAT=.
• Heatsink cleaning kit—Supplied with replacement CPU. Orderable separately as Cisco PID
• Thermal interface material (TIM)—Syringe supplied with replacement CPU. Use only if you are reusing
See also
CPU module bay. Install CPU module 1 first, and then CPU module 2 in the upper bay.
Note
If CPU module 2 is not present in the upper bay, you must have a blank filler
module in the upper bay or the server will not boot.
To populate the 12 DIMM slots with more than 768 GB of combined memory, you must use a
high-memory CPU that has a PID that ends with an "M", for example, UCS-CPU-6134M.
• The maximum number of DIMMs is 24 (only CPU 1 and CPU 2 memory channels).
• Some PCIe slots are unavailable when CPU module 2 is not present:
PCIe Slots Controlled by CPU Module
1
(CPUs 1 and 2)
1, 2, 5, 8, 9, 10
• Only four double-wide GPUs are supported, in PCIe slots 1, 2, 8, and 10.
• No front NVMe drives are supported.
• The optional NVMe-only drive bay module UCSC-C480-8NVME is not supported.
• If a rear RAID controller is used, it must be installed in PCIe slot 10 rather than the default slot 11.
A blank filler must be installed in slot 11.
UCSX-HSCK=.
your existing heatsink (new heatsinks have a pre-applied pad of TIM). Orderable separately as Cisco
PID UCS-CPU-TIM=.
Additional CPU-Related Parts to Order with RMA Replacement CPUs, on page
PCIe Slots Controlled by CPU Module
2
(CPUs 3 and 4)
3, 4, 6, 7, 11, 12
Cisco UCS C480 M5 Server Installation and Service Guide
Tools Required For CPU Replacement
102.
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