Specifications

Cisco UCS C240 M4 High-Density Rack Server (Small Form Factor Disk Drive Model)
SUPPLEMENTAL MATERIAL
63
CPUs and DIMMs
Physical Layout
Each CPU has four DIMM channels:
■ CPU1 has channels A, B, C, and D
■ CPU2 has channels E, F, G, and H
Each DIMM channel has three slots: slot 1, slot 2, and slot 3. The blue-colored DIMM slots are for slot 1, the
black-colored slots for slot 2, and the white slots for slot 3.
As an example, DIMM slots A1, B1, C1, and D1 belong to slot 1, while A2, B2, C2, and D2 belong to slot 2.
Figure 9 shows how slots and channels are physically laid out on the motherboard. The DIMM slots on the
right half of the motherboard (channels A, B, C, and D) are associated with CPU 1, while the DIMM slots on
the left half of the motherboard (channels E, F, G, and H) are associated with CPU 2. The slot 1 (blue) DIMM
slots are always located farther away from a CPU than the corresponding slot 2 (black) and slot 3 (white)
slots. Slot 1 slots (blue) are populated before slot 2 slots (black) and slot 3 (white) slots.
Figure 9 Physical Layout of CPU DIMM Channels and Slots
6 USB 3.0 slot on motherboard 15 RTC battery on motherboard
7 Power supplies
(hot-swappable, accessed through rear panel)
16 Embedded RAID header for RAID key
8 Trusted platform module (TPM) socket on
motherboard, under PCIe riser 2
17 SuperCap power module (RAID backup)
mounting location on air baffle
(not shown)
9 PCIe riser 2 (PCIe slots 4, 5, 6)