### ASUS PRIME B550M-K AM4 mATX Motherboard (Used)Reliable budget-friendly mATX motherboard based on AMD B550 chipset, designed for Socket AM4 Ryzen processors. Features 4 DDR4 slots, dual M.2 storage, PCIe 4.0 support and comprehensive I/O interfaces, delivers stable performance for daily office work, home entertainment and casual gaming.#### Core Features- **4 DDR4 Slots with Large Capacity**: 4 x DDR4 DIMM slots support up to 128GB dual-channel memory, up to 4800MHz overclocked, provides sufficient memory headroom for multi-tasking and light productivity work- **Dual High-Speed M.2**: 2 x M.2 slots, the main slot supports PCIe 4.0 x4 NVMe mode (up to 64Gbps), the second slot supports PCIe 3.0 x4 / SATA mode, greatly reduces system boot and file loading time- **Stable Digital Power Design**: 6+2 phase DIGI+ digital VRM with high-quality components, delivers stable power for Ryzen 5000 series processors, ensures consistent performance under long-time operation- **Full Video Outputs**: Equipped with HDMI + DVI-D + VGA (D-Sub) ports, compatible with both new and old monitors and display devices, no adapter needed- **Comprehensive Cooling & Protection**: PCH heatsink with Fan Xpert 2+ intelligent fan control, plus ASUS 5X Protection III circuits, improves system stability and motherboard durability- **Gigabit Network & HD Audio**: Realtek gigabit LAN for stable network connection; 8-channel HD audio with Japanese capacitors, delivers clear sound for daily media and communication- **Rich I/O Interfaces**: Multiple USB 3.2 Gen 2 / Gen 1 ports, front panel connectors, 4 x SATA 6Gb/s ports, meets all daily peripheral connection and storage expansion needs#### Condition & Testing StatementThis is a used motherboard that has passed strict full-function inspection:✅ CPU socket pins 100% intact, no bending or corrosion✅ Normal power-on, BIOS boot and system stability test passed✅ All memory slots, M.2, SATA, USB, audio and network ports fully functional✅ No repair history, no water damage, no hidden defectsFully cleaned and sanitized, ready for installation and use directly.#### Compatibility Notes- Compatible with **AMD Ryzen 3000 / 4000G / 5000 / 5000G series AM4 processors**- PCIe 4.0 function requires Ryzen 3000 / 5000 series desktop CPUs (APU models limited to PCIe 3.0)- Micro ATX form factor, fits all standard mATX and ATX PC cases- Supports DDR4 non-ECC unbuffered memory, dual-channel mode, memory overclocking supported- Onboard video outputs require a CPU with integrated graphics (F-series / non-APU CPUs not supported)