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B550 Micro-ATX motherboard for AMD Ryzen 3000/4000/5000 Series (AM4). Dual-channel DDR4 up to 128GB (4733MHz OC), PCIe 4.0 x16 + M.2, 4x SATA III, HDMI 2.1/DP 1.4, Realtek 1GbE LAN, 7.1 ALC897 audio, 5+3 VRM, Smart Fan 5. Processor manufacturerAMDProcessor socketSocket AM4Compatible processor seriesAMD Ryzen 3000 Series, AMD Ryzen 4000 Series, AMD Ryzen 5000 SeriesMotherboard chipsetAMD B550Motherboard form factormicro ATXSupported memory typesDDR4-SDRAMNumber of memory slots4Memory channelsDual-channelMaximum internal memory128 GBSupported memory clock speed (max)4733 MHz (OC)Number of M.2 (M) slots2Number of SATA III connectors4PCI Express x16 (Gen 4.x) slots1HDMI version2.1DisplayPort version1.4Ethernet LANYesEthernet interface typeGigabit EthernetLAN controllerRealtek RTL8111HAudio chipRealtek ALC897Audio output channels7.1 channelsWi-FiNoVRM Phases5+3 Pure DigitalRGB LED pin headers5 (2x ARGB, 3x RGB)CoolingSmart Fan 5, Enlarged MOSFET HeatsinkBIOS featuresQ-Flash Plus, XMP/DOCPWarranty period3 year(s)