AMD Epyc BIOS Tuning

My BIOS Settings for efficiency when idle, but performance under load

Disclaimer: list partially generated by ChatGPT

Power

• cTDP: Manual, 240W
• Package Power Limit: Manual, 240W
• Determinism Control: Manual
• Determinism Slider: Power
• Power Supply Idle Control: Typical Current Idle

CPU / Power Management

• Global C-state Control: Enabled
• DF C-States: Enabled
• APBDis: Auto
• CPPC: Enabled
• SMT: On

Memory

• TSME: Disabled

PCIe / IOMMU / Virtualization

• PCIe ARI: Enabled
• PCIe AER: Enabled, OS First
• IOMMU: Enabled
• Ten Bit Tag: Enabled
• SR-IOV: Enabled
• ACS: Auto or enabled (may require AER/ARI)
• Preferred IO: Manual, set to bus 41 for Tesla P40
• Enhanced Preferred IO Bus: Enabled
• PCIe Option ROMs: Disabled for all devices you don’t boot from