Recommended Memory Population - Cisco UCS C24 M3 Manual

SUPPLEMENTAL MATERIAL

Recommended Memory Population

This section explains the recommended DIMM population order rules for the C24 M3 server.
All DIMMs must be DDR3 DIMMs.
■
Mixing of Registered and Unbuffered DIMMs is not allowed per platform.
■
Mixing of ECC and non-ECC DIMMs is not allowed per platform.
■
Do not mix 1333-MHz DIMMs with 1600-MHz DIMMs.
■
Follow Table 23 when populating DIMMs in the server.
Table 23 Recommended DIMM Population
Total
Memory Blue Slots
Size Bank 0
(A0, B0, C0)
3 x 4 GB
48 GB 1
3 x 8 GB
72 GB 3 x 8 GB
3 x 8 GB
2
96 GB
3 x 16 GB
120 GB 3 x 16 GB
144 GB 3 x 16 GB
192 GB 3 x 16 GB
Notes . . .
1. For 48 GB, there are two possible sweet spot configurations:
6 x 8 GB occupies 1 DPC, so there is a possibility of increasing total memory size in the system (beyond 48 GB) by
going to 2 DPC while still maintaining memory speed at 1600 MHz.
If there is no plan to increase total memory size in the system (beyond 48 GB), then 12 x 4GB is more price
effective at this time.
2. For 96 GB, there are two possible optimal configurations:
6 x 16GB occupies 1 DPC, so there is a possibility of increasing total memory size in the system (beyond 96 GB) by
going to 2 DPC while maintaining the maximum memory speed at 1600 MHz.
12 x 8GB gives the peak performance for this configuration and is recommended if there is no plan of increasing
the total memory in the future.
44
CPU 1
Black Slots
Bank 1
(A1, B1, C1)
3 x 4 GB
—
3 x 4 GB
3 x 8 GB
—
3 x 4 GB
3 x 8 GB
3 x 16 GB
CPU 2
Blue Slots Black Slots
Bank 0 Bank 1
(D0, E0, F0) (D1, E1, F1)
3 x 4 GB 3 x 4 GB
3 x 8 GB
3 x 8 GB 3 x 4 GB
3 x 8 GB 3 x 8 GB
3 x 16 GB
3 x 16 GB 3 x 4 GB
3 x 16 GB 3 x 8 GB
3 x 16 GB 3 x 16 GB
Cisco UCS C24 M3 High-Density SFF Rack-Mount Server
Total DIMMs in
System
12
— 6
12
12
— 6
12
12
12