The HP L56021-602 “Erica2” AMD Matisse PROM motherboard is an OEM system board used in HP prebuilt desktop systems, mainly HP Pavilion / M01 series. It is based on the AMD AM4 platform and supports Ryzen “Matisse” generation processors, making it a mid-range consumer desktop motherboard designed for stable, locked OEM configurations.

This board is not a standard retail motherboard—it is a proprietary HP design made for specific HP cases and power supplies, meaning compatibility is restricted compared to normal AM4 boards. It is commonly found in systems that prioritize cost efficiency and integrated OEM design rather than upgrade flexibility.

Specifications:

• Part Number: L56021-602
• Board Name: Erica2 (HP OEM platform)
• Platform: AMD AM4
• Chipset: AMD B-series OEM chipset (platform varies by configuration)
• CPU Support: AMD Ryzen “Matisse” processors (3000 series)
• Memory Type: DDR4 SDRAM
• Memory Slots: 2 DIMM slots
• Form Factor: Proprietary micro-ATX / OEM layout (HP-specific design)
• Expansion Slots: PCIe x16 + additional PCIe slots (limited by OEM design)
• Storage Support: SATA III and M.2 NVMe (system dependent)
• Power Design: OEM HP proprietary power connector system

Features:

• Designed for HP prebuilt desktop systems (Erica2 platform)
• Supports AMD Ryzen desktop processors (Matisse generation)
• Compact OEM layout optimized for HP chassis design
• Includes integrated I/O and system-specific connectors
• Limited upgrade flexibility due to proprietary BIOS and power design
• Stable performance for general computing and business workloads
• Commonly used in HP Pavilion Gaming and M01 series desktops