Loading...
Loading...
On AMD PowerEdge R7625 systems with minimal memory installed, GPU workloads may degrade over time due to NUMA-related inefficiencies. The NPS=0 BIOS setting, which can help lessen this, may not appear under certain configurations. BIOS configuration on AMD R7625 systems does not show NPS=0 as a selectable option.GPU workloads initially perform well but degrades after ~20 minutes.Performance degradation happens when memory usage crosses NUMA boundaries.BIOS error UEFI0391 may appear when memory is not fully populated.
The NPS=0 option needs a balanced memory population across all memory channels. Systems with fewer than eight DIMMs (4 per socket) do not meet this requirement, preventing NPS=0 from appearing in BIOS. This leads to inefficient NUMA configurations and degraded GPU performance under memory pressure.
To enable NPS=0 and resolve performance issues: Install at least eight DIMMs (4 per socket) to meet the balanced memory requirement.Ensure both CPUs are detected during POST. A missing CPU can hide NPS=0 from BIOS.Update BIOS, iDRAC, and CPLD firmware to the latest available versionsVerify NPS=0 availability in BIOS or using iDRAC after memory upgrade.Enable NPS=0 For the best results, follow these published configuration guidelines: NVIDIA Certified Configuration Guide : Recommends system memory be at least twice the total GPU memoryDell EMC Balanced Memory Guide - AMD EPYC: Explains balanced configurations satisfy NPS 0/1 conditions by requiring that each memory channel is populated with identical DIMMs. Dell NUMA Configurations for AMD EPYC: States NPS=0 configures memory interleaving across all 16 channels in dual-socket systems.
Click on a version to see all relevant bugs
Dell Integration
Learn more about where this data comes from
Bug Scrub Advisor
Streamline upgrades with automated vendor bug scrubs
BugZero Enterprise
Wish you caught this bug sooner? Get proactive today.