DIMMs and Channels
The blade server contains 24 DIMM slots—12 per CPU. The maximum combined memory allowed in the 12
DIMM slots is 768 GB. To populate the 12 DIMM slots with more than 768 GB of combined memory, you
need to use a CPU with a SKU that ends with an "M", for example, UCS-CPU-6134M.
Each set of 12 DIMMs is arranged into six channels, where each channel has two DIMMs. Each DIMM slot
is numbered 1 or 2, and each DIMM slot 1 is blue and each DIMM slot 2 is black. Each channel is identified
by a letter:
•
Channels A, B, C, D, E, and F are for CPU 1.
•
Channels G, H, J, K, L, and M are for CPU 2.
The following figure shows how DIMMs and channels are physically laid out and numbered. The DIMM
slots for CPU 1, which is at the front of the server, are above and below the CPU and heatsink. The DIMM
slots for CPU 2, which is at the rear of the server, are above and below the CPU and heatsink.
DIMMs should be evenly distributed based on the number of CPUs installed. Do not mix DIMM types
(LRDIMM, RDIMM, TSV-RDIMMs).
Only Cisco memory is supported. Third-party DIMMs are not tested or supported.Caution
Figure 16: Physical Location of DIMM Slots
Cisco UCS B200 M5 Blade Server Installation and Service Note
37
Servicing a Blade Server
DIMMs and Channels
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