- Determinism Slider:
-
Selects the determinism mode for the CPU:
- Power: Maximizes performance within the power limits defined by cTDP and PPT. Increase imbalance between cores.
- Performance (default): Provides predictable performance across all processors of the same type.
- IOMMU:
-
- Disable (default)
- Enable: Enables the I/O Memory Management Unit (IOMMU), which extends the AMD64 system architecture by adding support for address translation and system memory access protection on DMA transfers from peripheral devices. Enabling also allows to see 256 cores with hyperthreading.
- NUMA nodes per socket:
-
Specifies the number of desired NUMA nodes per populated socket in the system:
- NPS1: Each physical processor is a NUMA node, and memory accesses are interleaved across all memory channels directly connected to the physical processor.
- NPS2: Each physical processor is two NUMA nodes, and memory accesses are interleaved across 4 memory channels.
- NPS4(default): Each physical processor is four NUMA nodes, and memory accesses are interleaved across 2 memory channels. Gives better memory throughput.
- Local APIC mode:
-
- xAPIC (default)
- x2APIC: Enables the x2APIC mode which helps operating systems run more efficiently on high core count configurations and optimizes interrupt distribution in virtualized environments. Necessary to see 255 cores in hyperthreading mode.
- xGMI Link Width Control:
-
Auto (x16)
Manual: Enables to change manually the link width to:
- 0:Force xGMI link width to x2
- 1:Force xGMI link width to x8. Reduce the energy consumption of the link and therefore give higher power for computation.
- 2(default):Force xGMI link width higher. Better for cross-socket communications.