Specification CPU - Supports 3rd Gen AMD AM4 Ryzen™ / Future AMD Ryzen™ Processors* - Digi Power Design - 14 Power Phase Design *Not Compatible With AMD Ryzen™ 5 3400G And Ryzen™ 3 3200G. Chipset AMD B550 Memory - Dual Channel DDR4 Memory Technology - 4 X DDR4 DIMM Slots - AMD Ryzen Series CPUs (Matisse) Support DDR4 4733+(OC) / 4666(OC) / 4600(OC) / 4533(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3200 / 2933 / 2667 / 2400 / 2133 ECC & Non-ECC, Un-Buffered Memory* - AMD Ryzen Series APUs (Renoir) Support DDR4 4733+(OC) / 4666(OC) / 4600(OC) / 4533(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3200 / 2933 / 2667 / 2400 / 2133 ECC & Non-ECC, Un-Buffered Memory* - Max. Capacity Of System Memory: 128GB** - Supports Extreme Memory Profile (XMP) Memory Modules - 15μ Gold Contact In DIMM Slots *For Ryzen Series CPUs (Picasso), ECC Is Only Supported With PRO CPUs. BIOS - 256Mb AMI UEFI Legal BIOS With GUI Support - Supports "Plug And Play" - ACPI 5.1 Compliance Wake Up Events - Supports Jumperfree - SMBIOS 2.3 Support - CPU, CPU VDDCR_SOC, DRAM, VPPM, VTT_DDR Offset, CPU VDD 1.8 Voltage Multi-Adjustment Graphics       - Integrated AMD Radeon Vega Series Graphics In Ryzen Series APU* - DirectX 12, Pixel Shader 5.0 - Shared Memory Default 2GB. Max Shared Memory Supports Up To 16GB.** - Dual Graphics Output: Support HDMI And D-Sub Ports By Independent Display Controllers - Supports HDMI 2.1 With Max. Resolution Up To 4K X 2K (4096x2160) @ 60Hz - Supports D-Sub With Max. Resolution Up To 1920x1200 @ 60Hz - Supports Auto Lip Sync, Deep Color (12bpc), XvYCC And HBR (High Bit Rate Audio) With HDMI 2.1 Port (Compliant HDMI Monitor Is Required) - Supports HDR (High Dynamic Range) With HDMI 2.1 - Supports HDCP 2.3 With HDMI 2.1 Port - Supports 4K Ultra HD (UHD) Playback With HDMI 2.1 Port - Supports Microsoft® PlayReady *Actual Support May Vary By CPU **The Max Shared Memory 16GB Requires 32GB System Memory Installed. *Actual Support May Vary By CPU **The Max Shared Memory 16GB Requires 32GB System Memory Installed. Audio     - 7.1 CH HD Audio With Content Protection (Realtek ALC1200 Audio Codec) - Premium Blu-Ray Audio Support - Supports Surge Protection - PCB Isolate Shielding - Individual PCB Layers For R/L Audio Channel - Nahimic Audio LAN   - PCIE X1 Gigabit LAN 10/100/1000 Mb/S - Realtek RTL8111H - Supports Wake-On-LAN - Supports Lightning/ESD Protection - Supports Energy Efficient Ethernet 802.3az - Supports PXE Slots AMD Ryzen Series CPUs (Matisse) - 2 X PCI Express X16 Slots (PCIE1: Gen4x16 Mode; PCIE3: Gen3 X4 Mode)* AMD Ryzen Series APUs (Renoir) - 2 X PCI Express X16 Slots (PCIE1: Gen3x16 Mode; PCIE3: Gen3 X4 Mode)* - 2 X PCI Express 3.0 X1 Slots - Supports AMD Quad CrossFireX™ And CrossFireX™ - 1 X M.2 Socket (Key E), Supports Type 2230 WiFi/BT Module - 15μ Gold Contact In VGA PCIe Slot (PCIE1) *Supports NVMe SSD As Boot Disks Storage - 6 X SATA3 6.0 Gb/S Connectors, Support RAID (RAID 0, RAID 1 And RAID 10), NCQ, AHCI And Hot Plug* - 1 X Hyper M.2 Socket (M2_1), Supports M Key Type 2230/2242/2260/2280 M.2 PCI Express Module Up To Gen4x4 (64 Gb/S) (With Matisse) Or Gen3x4 (32 Gb/S) (With Renoir)** - 1 X M.2 Socket (M2_2), Supports M Key Type 2230/2242/2260/2280/22110 M.2 SATA3 6.0 Gb/S Module And M.2 PCI Express Module Up To Gen3 X2 (16 Gb/S)** *M2_2 And SATA3_5_6 Share Lanes. If Either One Of Them Is In Use, The Other One Will Be Disabled. **Supports NVMe SSD As Boot Disks Supports ASRock U.2 Kit Connector - 1 X COM Port Header - 1 X SPI TPM Header - 1 X Power LED And Speaker Header - 2 X RGB LED Headers* - 2 X Addressable LED Headers** - 1 X CPU Fan Connector (4-Pin)*** - 1 X CPU/Water Pump Fan Connector (4-Pin) (Smart Fan Speed Control) - 4 X Chassis/Water Pump Fan Connectors (4-Pin) (Smart Fan Speed Control)**** - 1 X 24 Pin ATX Power Connector - 1 X 8 Pin 12V Power Connector - 1 X 4 Pin 12V Power Connector - 1 X Front Panel Audio Connector - 2 X USB 2.0 Headers (Support 4 USB 2.0 Ports) (Supports ESD Protection) - 1 X USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 Ports) (Supports ESD Protection) *Support In Total Up To 12V/3A, 36W LED Strip **Support In Total Up To 5V/3A, 15W LED Strip ***The CPU Fan Connector Supports The CPU Fan Of Maximum 1A (12W) Fan Power. ****The Chassis/Water Pump Fan Supports The Water Cooler Fan Of Maximum 2A (24W) Fan Power. CPU_FAN2/WP, CHA_FAN1/WP, CHA_FAN2/WP, CHA_FAN3/WP And CHA_FAN4/WP Can Auto Detect If 3-Pin Or 4-Pin Fan Is In Use. Rear Panel I/O - Antenna Bracket - 1 X PS/2 Mouse/Keyboard Port - 1 X D-Sub Port - 1 X HDMI Port - 1 X USB 3.2 Gen2 Type-A Port (10 Gb/S) (Supports ESD Protection) - 1 X USB 3.2 Gen2 Type-C Port (10 Gb/S) (Supports ESD Protection) - 4 X USB 3.2 Gen1 Ports (Supports ESD Protection) - 1 X RJ-45 LAN Port With LED (ACT/LINK LED And SPEED LED) - HD Audio Jacks: Line In / Front Speaker / Microphone Software And UEFI Software - ASRock Motherboard Utility (A-Tuning) - ASRock Polychrome SYNC - ASRock XFast LAN UEFI - ASRock Full HD UEFI - ASRock Instant Flash *These Utilities Can Be Downloaded From ASRock Live Update & APP Shop. Support CD - Drivers, Utilities, AntiVirus Software (Trial Version), Google Chrome Browser And Toolbar Accessories - Quick Installation Guide, Support CD, I/O Shield - 4 X SATA Data Cables - 3 X Screws For M.2 Sockets - 2 X Standoffs For M.2 Sockets Hardware Monitor Temperature Sensing: CPU, CPU/Water Pump, Chassis/Water Pump Fans - Fan Tachometer: CPU, CPU/Water Pump, Chassis/Water Pump Fans - Quiet Fan (Auto Adjust Chassis Fan Speed By CPU Temperature): CPU, CPU/Water Pump, Chassis/Water Pump Fans - Fan Multi-Speed Control: CPU, CPU/Water Pump, Chassis/Water Pump Fans - Voltage Monitoring: +12V, +5V, +3.3V, CPU Vcore, CPU VDDCR_SOC, DRAM, VPPM, CPU VDD 1.8V Form Factor - ATX Form Factor: 12.0-In X 9.6-In, 30.5 Cm X 24.4 Cm - Solid Capacitor Design - 2oz Copper PCB OS - Microsoft® Windows® 10 64-Bit Certifications - FCC, CE - ErP/EuP Ready (ErP/EuP Ready Power Supply Is Required) ASRock B550 Pro4 MOTHERBOARD Supports 3rd Gen AMD AM4 Ryzen™ / Future AMD Ryzen™ Processors 8 Power Phase Design, Digi Power Supports DDR4 4733+ (OC) 1 PCIe 4.0 X16, 1 PCIe 3.0 X16, 2 PCIe 3.0 X1, 1 M.2 Key E For WiFi Graphics Output Options: HDMI, D-Sub AMD CrossFireX™ 7.1 CH HD Audio (Realtek ALC1200 Audio Codec), Nahimic Audio 6 SATA3, 1 Hyper M.2 (PCIe Gen4 X4), 1 M.2 (PCIe Gen3 X2 & SATA3) 2 USB 3.2 Gen2 (Rear Type A+C), 6 USB 3.2 Gen1 (2 Front, 4 Rear) Gigabit LAN ..