Table 41. 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
48
6x2x4
2, 1
2, 1, 0
32
4x2x4
4, 2, 1
4, 2, 1, 0
24
3x2x4
1
1, 0
16
2x2x4
2, 1
2, 1, 0
16
4x2x2
4, 2, 1
4, 2, 1, 0
8
4x2x1
4, 2, 1
4, 2, 1, 0
8
2x2x2
2, 1
2, 1, 0
NOTE:
If the system configuration does not support an NPS profile, the options are not displayed until the configuration
changes.
NOTE:
If there is a memory training failure, configuration change, or processor swap that no longer supports a specific
NPS profile, an error message is displayed at the end of POST and logged in the LifeCycle Controller.
Interleaving option
Based on the NPSx selection, the AMD Platform Security Processor (PSP) firmware selects the corresponding preferred memory
interleaving. If the memory configuration does not allow the preferred option (Example: a channel is not populated or one or more DIMMs
on a channel does not initialize or train properly), the pre-BIOS firmware selects the corresponding alternate memory interleaving option.
Table 42. Interleaving Options Based on NPSx
NPSx
Preferred
Alternate
4
2-channel
None
2
4-channel
2-channel
1
8-channel
4-channel, 2-channel
0
16-channel (dual processor)
2-channel
NOTE:
In a dual processor system both sockets have to be in the same interleaving mode if both sockets have memory
populated.
Two channel interleaving (per quadrant) - NPS4 and fallback for NPS2/1/0
•
This interleaves two channels in each quadrant.
•
Does not require the memory to be equal on both channels of a quadrant. Any non-symmetrical DIMM is stacked on top.
•
Any quadrant where one of the two channels is not populated is not interleaved.
•
There is no alternate, as all configurations can be mapped into this mode.
Four channel interleaving (per half-socket) - NPS2
•
This interleaves the four channels on the left or right half of a socket. As an alternative option from NPS1 only, the four channels {CS
A, B, C, D} may be interleaved.
•
Requires all four channels to be populated with equal size memory.
•
There is no requirement that the two halves have equal size memory with respect to each other.
•
The system has support for one half to have no memory.
•
In a dual processor system:
•
There is no requirement that both sockets have the same number of halves populated.
•
There is no requirement that each of the four halves has the same amount of memory with respect to each other.
•
The system allows for one of the sockets to have no memory.
Eight channel interleaving (per socket) - NPS1
•
This interleaves eight channels in a socket.
NOTE:
{CS A, B, C, D} and {CS E, F, G, H} is only recommended as a memory population if all eight channels are
populated as NPS2.
72
Installing and removing system components
