Asus PRIME B850-PLUS
Specifications
- Manufacturer: Asus
- Chipset: B850
- Socket: AM5
- Form Factor: ATX
- DIMM Slots: 4
- Color: Black / Silver
BIOS Update Status
- AGESA 1.2.0.3C
Improves high-density memory compatibility, allowing stable operation of 4x DIMM configurations and 256GB total capacity.
- AGESA 1.2.7.0
Major enablement patch for next-generation 2026 processors; updates the PSP firmware and improves USB compatibility.
- AGESA 1.3.0.0
Preliminary support for the next major AM5 architecture revision; includes significant security hardening and memory training overhauls.
Latest BIOS Version
"1. AGESA updated to ComboAM5 PI_1.3.0.0a.Before running the USB BIOS Flashback tool, please rename the BIOS file (A5659.CAP) using BIOSRenamer."
BIOS Release Notes Analysis
Launch Stability & Compatibility
The Asus PRIME B850-PLUS initializes platform operations with v0602. Update v1022 expands processor compatibility to the Ryzen 9 9950X3D and 9900X3D series, introducing AI Cache Boost to optimize compute performance in AI-driven workloads. Subsequent firmware v1028 refines memory controller logic to support high-capacity DIMM configurations, addressing stability challenges associated with high-density DDR5 modules.
Feature Maturity & Hardware Support
Mid-cycle development focuses on iterative AGESA integration to refine system architecture. Version v1078 updates the codebase to AGESA 1.2.0.3f, which enhances overclocking support and broadens device interoperability. This is followed by v1087, which implements AGESA 1.2.0.3g, and v1081, which applies general stability patches to ensure consistent system behavior across varied hardware configurations.
Critical Security & Power Management
Firmware v1065 introduces critical hardening via AGESA 1.2.0.3e, which mitigates the TPM Out-of-Bounds Read vulnerability (CVE-2025-2884) and enforces anti-rollback mechanisms to secure the boot chain. The update path culminates in v1402, which transitions the system to AGESA 1.2.7.0; this major revision updates the PSP firmware and establishes preliminary architectural support for next-generation 2026 processors.
ℹ️AI-synthesized summary derived from official changelogs and verified microcode specifications. Always verify with the manufacturer.