Asus Prime A520M-K/CSM M-ATX Motherboard
MPN PRIME-A520M-K-CSM · Brand ASUS · mATX
The ASUS Prime A520M-K/CSM is a Micro-ATX motherboard with AMD AM4 socket, AMD A520 chipset, dual-channel DDR4 support up to 64GB, one M.2 slot, HDMI 2.1 output, and ASUS 5X Protection III hardware safeguards — a solid choice for compact AMD Ryzen builds
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Overview
The ASUS Prime A520M-K/CSM is a Micro-ATX motherboard built on the AMD A520 chipset, designed to pair with AMD Ryzen desktop processors using the AM4 socket. It supports Ryzen 5000 Series, 5000 G-Series, 4000 G-Series, 3000 Series, and 3000 G-Series processors, making it a versatile foundation for compact AMD builds ranging from everyday productivity systems to light workstation deployments. Memory capacity reaches up to 64GB across two DIMM slots using DDR4 in dual-channel configuration. Native DDR4 speeds start at 2133MHz, with overclocked profiles extending up to 4866MHz (O.C.), giving builders flexibility as they upgrade RAM over time. ECC memory operation is supported but depends on the installed CPU. For storage, the board provides one M.2 Socket 3 slot (M Key, 2242/2260/2280) supporting both PCIe 3.0 x4 and SATA modes, alongside four SATA 6Gb/s ports with RAID 0, 1, and 10 support via the A520 chipset — a capable array for OS drives, bulk storage, and NVMe SSDs in a single compact chassis. Display output is handled by one HDMI 2.1 port (4K at 60Hz) and one D-Sub port at the rear I/O, useful when pairing the board with an AMD Ryzen G-Series APU that includes integrated graphics. Networking is provided by a Realtek RTL8111H Gigabit Ethernet controller, complemented by ASUS LANGuard surge protection. The onboard audio uses a Realtek ALC887/897 codec delivering 7.1-channel HD audio with dedicated PCB layers and audio shielding for cleaner signal separation. Rear connectivity includes four USB 3.2 Gen 1 Type-A ports and two USB 2.0 ports. Internal headers add two further USB 3.2 Gen 1 and four USB 2.0 ports for front-panel connections. A PS/2 combo port accommodates legacy peripherals. ASUS 5X Protection III covers hardware-level safeguards including DIGI+ VRM digital power delivery, LANGuard, overvoltage protection, SafeSlot Core PCIe reinforcement, and stainless-steel back I/O shielding. The board ships with an aluminum PCH heatsink for passive chipset cooling and supports Fan Xpert fan management software. The UEFI BIOS uses a 256Mb Flash ROM with AMI firmware, and includes ASUS CrashFree BIOS 3, EZ Flash 3, and an EZ Mode interface for simplified setup. Wake- LAN (WOL by PME) and PXE network boot are supported for managed deployments. Key Verified Specifications: - Form Factor: Micro-ATX (22.6 cm x 22.1 cm) - Socket: AMD AM4 - Chipset: AMD A520 - Memory: 2x DIMM, DDR4, max 64GB, dual-channel, up to 4866MHz (O.C.) - Storage: 1x M.2 (PCIe 3.0 x4 / SATA, type 2242/2260/2280) + 4x SATA 6Gb/s (RAID 0/1/10) - Display: 1x HDMI 2.1 (4K@60Hz), 1x D-Sub - LAN: Realtek RTL8111H 1Gb Ethernet - Audio: Realtek ALC887/897, 7.1 HD Audio, 24-bit/192kHz - Rear USB: 4x USB 3.2 Gen 1 Type-A, 2x USB 2.0 - PCIe: 1x PCIe 3.0 x16, 2x PCIe 3.0 x1 - BIOS: 256Mb Flash ROM, UEFI AMI - Warranty: 3 Years
Datasheet
| Memory Type | DDR4 |
|---|---|
| Warranty | 3 Years |
| Form Factor | mATX |
| Chipset | A520 |
| Socket | AM4 |
| CPU Type | AMD AM4 Socket for AMD Ryzen 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series/ 3000 G-Series Desktop Processors |
| Max Memory | 64 GB |
| Memory Speed | up to 4866 |
| Lan | Realtek RTL8111H 1Gb Ethernet ASUS LANGuard |
| Bios | 256 Mb Flash ROM, UEFI AMI BIOS |
| Audio | Realtek ALC887/897 7.1 Surround Sound High Definition Audio CODEC Supports : Jack-detection, Multi-streaming, Front Panel Jack-retasking, up to 24-Bit/192kHz playback Audio Feature : Audio Shielding Dedicated audio PCB layers |
| Model | PRIME A520M-K/CSM |
| Memory | 2 x DIMM, Max. 64GB, DDR4 4866(O.C)/4600(O.C)/4466(O.C.)/ 4400(O.C)/4333(O.C.)/4266(O.C.) /4200(O.C.)/4133(O.C.)/4000(O.C.) /3866(O.C.)/3733(O.C.)/3600(O.C.)/ 3466(O.C.)/3400(O.C.)/3333(O.C.)/ 3200/3000/2933/2800/2666/2400/ 2133 MHz Un-buffered Memory Dual Channel Memory Architecture ECC Memory (ECC mode) support varies by CPU |
| Graphic | 1 x D-Sub 1 x HDMI 2.1(4K@60HZ) |
| Storage | Total supports 1 x M.2 slot(s) and 4 x SATA 6Gb/s ports AMD Ryzen 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series/ 3000 G-Series Desktop Processors : 1 x M.2 Socket 3, with M Key, Type 2242/2260/2280 (PCIE 3.0 x4 and SATA modes) storage devices support AMD A520 Chipset : 4 x SATA 6Gb/s port(s), Support Raid 0, 1, 10 |
| Platform | AMD |
| USB Ports | Rear USB Port ( Total 6 ) 4 x USB 3.2 Gen 1 port(s)(4 x Type-A) 2 x USB 2.0 port(s)(2 x Type-A) Front USB Port ( Total 6 ) 2 x USB 3.2 Gen 1 port(s)(2 x Type-A) 4 x USB 2.0 port(s)(4 x Type-A) |
| Accessories | User´s manual 1 x ACC Express Activation Key Card I/O Shield 2 x SATA 6Gb/s cable(s) 1 x Supporting DVD 1 x M.2 SSD screw package(s) |
| Graphics Port | 1 x HDMI 2.1 |
| Manageability | WOL by PME, PXE |
| Back I/O Ports | 1 x PS/2 keyboard/mouse combo port(s) 1 x D-Sub 1 x HDMI 1 x LAN (RJ45) port(s) 4 x USB 3.2 Gen 1 (blue) Type-A 2 x USB 2.0 3 x Audio jack(s) |
| Memory Feature | Un-buffered Memory Dual Channel Memory Architecture,ECC Memory (ECC mode) support varies by CPU |
| Expansion Slots | AMD Ryzen 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series/ 3000 G-Series Desktop Processors AMD A520 Chipset 2 x PCIe 3.0 x1 1 x PCIe 3.0 x16 (x16 mode) |
| Operating System | Windows 10 64-bit |
| Channel Supported | Dual Channel |
| Software Features | ASUS Exclusive Software Armoury Crate AI Suite 3 – Performance and Power Saving Utility TurboV EVO EPU Digi+ VRM Fan Xpert – EZ update ASUS CPU-Z AI Charger DAEMON Tools Norton Anti-virus software (Free Trial for 60 days) WinRAR UEFI BIOS ASUS EZ DIY – ASUS CrashFree BIOS 3 – ASUS EZ Flash 3 – ASUS UEFI BIOS EZ Mode |
| Internal I/O Ports | 1 x CPU Fan connector(s) 1 x Chassis Fan connector(s) 1 x USB 3.2 Gen 1(up to 5Gbps) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s) 2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s) 1 x M.2 Socket 3 with M key, type 2242/2260/2280 storage devices support (SATA & PCIE 3.0 x 4 mode) 1 x SPI TPM header 4 x SATA 6Gb/s connector(s) 1 x S/PDIF out header(s) 1 x 24-pin EATX Power connector(s) 1 x 8-pin EATX 12V Power connectors 1 x Front panel audio connector(s) (AAFP) 1 x Clear CMOS jumper(s) 1 x System panel connector 1 x COM port header 1 x Speaker connector |
| Back Panel I/O Ports | 4 x USB 3.2 Gen 1 (blue) Type-A 1 x PS/2 keyboard/mouse combo port(s) 1 x D-Sub 1 x HDMI 1 x LAN (RJ45) port(s) 2 x USB 2.0 3 x Audio jack(s) |
| Asus Special Features | ASUS 5X PROTECTION III – ASUS DIGI+ VRM – ASUS LANGuard – ASUS Overvoltage Protection – ASUS SafeSlot Core – ASUS Stainless-Steel Back I/O ASUS Q-Design – ASUS Q-DIMM – ASUS Q-Slot ASUS Thermal Solution – Aluminum heatsink design |
| Internal I/O Connector | 1 x COM port header 1 x USB 3.2 Gen 1(up to 5Gbps) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s) 1 x CPU Fan connector(s) 1 x Chassis Fan connector(s) 2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s) 1 x M.2 Socket 3 with M key, type 2242/2260/2280 storage devices support (SATA & PCIE 3.0 x 4 mode) 1 x SPI TPM header 4 x SATA 6Gb/s connector(s) 1 x S/PDIF out header(s) 1 x 24-pin EATX Power connector(s) 1 x 8-pin EATX 12V Power connectors 1 x Front panel audio connector(s) (AAFP) 1 x Clear CMOS jumper(s) 1 x System panel connector 1 x COM port header 1 x Speaker connector |
