Specifications

QSSC-S4R Technical Product Specification BIOS Initialization
147
Figure 72. Hemisphere Example
16.2.10.5.1 NUMA in Hemisphere Mode
Hemisphere mode is enabled by default if system memory configuration supports. When NUMA is enabled in BIOS
Setup Inter-Socket interleaving will be disabled because when NUMA is enabled only 2-way interleaving is
supported.4-way or 8-way interleaving is not possible along with NUMA. NUMA can be enabled even if Hemisphere
mode is disabled.
16.2.10.5.2 Interleaving in Hemisphere Mode.
Hemisphere mode can have 2-way,4-way or 8-way interleaving. But when NUMA is also enabled, Hemisphere mode
can have only 2-way interleaving supported.
16.2.10.5.3 Mirroring in Hemisphere Mode
Intra-socket mirroring is NOT possible in hemisphere mode.
Inter-socket mirroring in hemisphere mode is possible. One node of each CPU socket is configured as primary copy.
The second node of the CPU sockets is configured as secondary copy. All nodes of CPU1 and CPU2 should be
populated identical for mirroring in hemisphere mode. Minimum memory population for Mirroring in hemisphere mode
is identical DIMMs on DIMM_1D/DIMM_1B on all of MEM1_SLOT, MEM2_SLOT, MEM3_SLOT and MEM4_SLOT .