From the Manufacturer
https://www.asus.com/us/Motherboards/PRIME-B350-PLUS/
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Mfr Part Number: PRIME B350-PLUS
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CPU: Socket AM4
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Supports AMD Ryzen/7th Generation A-series/Athlon Processors
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Supports CPU up to 8 Cores
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Chipset: AMD B350
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Memory: 4x DDR4-2666/ 2400/ 2133 MHz DIMM Slots, ECC/Non-ECC, Un-buffered, Max Capacity of 64GB; 4x DDR4-2400/ 2133 MHz DIMM Slots, Dual Channel, Non-ECC, Un-buffered, Max Capacity of 64GB
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Slots: 2x PCI-Express 3.0/2.0 x16 Slots (one runs at x8), 1x PCI-Express 2.0 x16 Slot (runs at x4), 2x PCI-Express 2.0 x1 Slots, 2x PCI Slots
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Multi-Graphics: Supports AMD CrossFireX Technology
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Storage:
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SATA: 6x SATA3 Ports, Support RAID 0, 1, 10
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M.2: 2x M.2 Ports (w/ M Key), one support type 2242/ 2260/ 2280/ 22110 PCIE 3.0 x4 and SATA modes, one support type 2242/ 2260/ 2280/ 22110 PCIE 3.0 x2 and SATA modes
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Audio: Realtek ALC 887-VD2 8-Channel High Definition Audio CODEC
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LAN: Realtek 8111H Gigabit Ethernet Controller
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Ports: 2x USB 3.1 Ports, 6x USB 3.0/2.0 Ports (4 rear, 2 at mid-board), 6x USB 2.0/1.1 Ports (2 rear, 4 at mid-board), 1x PS/2 Keyboard/Mouse Combo Port, 1x VGA Port, 1x DVI-D Port, 1x HDMI Port, 1x RJ45 LAN Port, Audio I/O Jacks
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Power Connector: 1x 24-pin EATX Power Connector, 1x 8-pin ATX 12V Power Connector
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Form Factor: ATX, 12.00 x 9.35 inch / 30.5 x 23.7 cm