Processor
Configuration
Memory population
Memory population
information
Dual processor (Start with
processor1. Processor 1 and
processor 2 population
should match)
Optimizer (Independent
channel) population order
A{1}, B{1}, A{2}, B{2}, A{3}, B{3},
A{4}, B{4}, A{5}, B{5}, A{6}, B{6},
A{7}, B{7} A{8}, B{8}
Odd amount of DIMMs per
processor allowed.
NOTE:
Odd number of
DIMMs will result in
unbalanced memory
configurations, which
in turn will result in
performance loss. It is
recommended to
populate all memory
channels identically
with identical
electrical
specification DIMMs
for best performance.
Optimizer population order is
not traditional for 8 and 16
DIMMs installations for dual
processor.
•
For 8 DIMMs: A{6},
A{5}, A{2}, A{1}, A{8},
A{7}, A{4}, A{3}
•
For 16 DIMMs: A{6},
B{6} A{5}, B{5} A{2},
B{2} A{1}, B{1}, A{8},
B{8}, A{7}, B{7}, A{4},
B{4} A{3}, B{3}
•
For dual-processor systems, sockets A1 to A8 and sockets B1 to B8 are available.
•
Populate all the sockets with white release tabs first, followed by the black release tabs.
•
In a dual-processor configuration, the memory configuration for each processor must be identical.
For example, if you populate socket A1 for processor 1, then populate socket B1 for processor 2, and so on.
•
Unbalanced or odd memory configuration results in a performance loss and system may not identify the memory modules being
installed, so always populate memory channels identically with identical electrical specification DIMMs for best performance.
•
Minimum recommended configuration is to populate four identical electrical specifications memory modules per processor. AMD
recommends limiting processors in that system to 32 cores or less.
•
Populate eight identical electrical specification memory modules per processor (one DIMM per channel) at a time to maximize
performance.
Non-uniform memory access (NUMA)
Non-uniform memory access (NUMA) is a memory design used in multi-processing, where the memory access time depends on the
memory location relative to the processor. In NUMA, a processor can access its own local memory faster than the non-local memory.
NUMA nodes per socket (NPS)
NUMA nodes per socket (NPS) is a new feature added that allows you to configure the memory NUMA domains per socket. The
configuration can consist of one whole domain (NPS1), two domains (NPS2), or four domains (NPS4). In the case of a two-socket
platform, an additional NPS profile is available to have whole system memory to be mapped as single NUMA domain (NPS0).
In the processors, each physical processor package contains multiple processor cores that are grouped together into core complexes and
core complex dies. A core complex (CCX) consists of maximum four processor cores and an L3 cache memory. A core complex die (CCD)
contains two CCXs. The physical processor package contains maximum eight core CCDs. A max CCD x CCX x Core processor will have
64 cores. The BIOS setup allows for the selection of an NPS profile based on down core profile and by processor SKU.
Table 35. NPS options per processor SKU or down core configuration
Cores
CCDs x CCXs x Cores/CCX
NPSx options - Single
processor
NPSx options - Dual
processor
64
8x2x4
4, 2, 1
4, 2, 1, 0
40
Installing and removing system components for PowerEdge C6525
