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● If DIMMs with different ranks are installed on one CPU socket, follow
memory module population order.
● When single-rank, dual-rank and quad-rank DIMMs are populated for 2DPC,
always populate the higher number rank DIMM first (starting from the
farthest slot), for example, first quad-rank, then dual-rank, and last single-
rank DIMM.
● Assembling DIMMs should start from high to low capacity at first. Example:
32 GB first, then 16 GB and then 8 GB.
● If only one DIMM is populated in a channel, then populate it in the slot
furthest away from CPU.
The notation of the CPUs, memory channels, and DIMM sockets
correspond to the silk print on system board.
▶ On CPU 1, the memory channels are named A, B, C, D, E, F
▶ On CPU 2, the memory channels are named G, H, J, K, L, M
▶ On CPU 3, the memory channels are named N, P, Q, R, S, T
▶ On CPU 4, the memory channels are named U, V, W, X, Y, Z
10.2.3
Modes of operation
10.2.3.1
Independent Channel mode
Independent Channel mode with identical DIMMs - 2 CPUs populated
● Same letter represents identical DIMMs (capacity, rank).
● Use a "balanced" platform configuration:
– all available memory channels populated equally
– identical DIMMs in all locations (size/speed/rank)
● Marked (*) quantity of DIMMs are not recommended because of unbalanced
configurations.
● Unbalanced configurations can lead to significantly reduced bandwidth
because the system will fracture the memory space into multiple regions.
RX4770 M5
Upgrade and Maintenance Manual
Main memory
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