• If your server's firmware and Cisco UCS Manager software are already at the required minimums shown
above (or later), you can replace the CPU hardware by using the procedure in this section.
• If your server's firmware and Cisco UCS Manager software are earlier than the required levels, use the
instructions in the Cisco UCS C- and S-Series M5 Servers Upgrade Guide for Next Gen Intel Xeon
Processors to upgrade your software. After you upgrade the software, return to this section as directed
to replace the CPU hardware.
CPU Configuration Rules
This server has two CPU sockets on the motherboard. Each CPU supports six DIM channels (12 DIMM slots).
See DIMM Slot Numbering, on page 37.
• The server can operate with one CPU or two identical CPUs installed.
• The minimum configuration is that the server must have at least CPU 1 installed. Install CPU 1 first, and
then CPU 2.
• For Intel Xeon Scalable processors (first generation): The maximum combined memory allowed in
the 12 DIMM slots controlled by any one CPU is 768 GB. 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.
• For Second Generation Intel Xeon Scalable processors: These Second Generation CPUs have three
memory tiers. These rules apply on a per-socket basis:
• If the CPU socket has up to 1 TB of memory installed, a CPU with no suffix can be used (for
example, Gold 6240).
• If the CPU socket has 1 TB or more (up to 2 TB) of memory installed, you must use a CPU with
an M suffix (for example, Platinum 8276M).
• If the CPU socket has 2 TB or more (up to 4.5 TB) of memory installed, you must use a CPU with
an L suffix (for example, Platinum 8270L).
• The following restrictions apply when using a single-CPU configuration:
• Any unused CPU socket must have the protective dust cover from the factory in place.
• The maximum number of DIMMs is 12 (only CPU 1 channels A, B, C, D, E, F).
• PCIe riser 2 (slot 2) is unavailable.
• Front-loading NVME drives are unavailable (they require PCIe riser 2).
• The NVIDIA Tesla P4 GPU is not supported with Second Generation Intel Xeon Scalable processors.
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=.
Maintaining the Server
24
Maintaining the Server
CPU Configuration Rules
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