AM4 · Micro-ATX · DDR4 · board-only configuration · MSI global specification
A compact Micro-ATX AM4 motherboard with AMD A520: two DDR4 slots (up to 64 GB, DDR4-4600+ OC), a PCIe 3.0 x16 graphics slot, one M.2 slot and Realtek 1 Gb Ethernet.
Specifications checked 21 Sept 2026.
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Manufacturer specificationsUK manufacturer specification · PRIME A520M-E/CSM
PRIME A520M-E/CSM motherboard, identified in the ASUS UK catalogue. Specifications below retain the manufacturer’s configuration and interface conditions.
Specifications checked 17 Oct 2026.
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Differences first. Select a topic for its graphic, sources and conditions.
Different hardware. A chip name or generation does not quantify real-world performance.
Plan the complete platform. Check the exact CPU-support list, required BIOS and memory validation before buying. PCIe generations and lane allocations can change with the processor. A socket match or slot count is not a guarantee that every component works together at its highest advertised setting.
6 verified differences, most decision-relevant first. All are also drawn in Visual facts above. Missing information stays separate.
Manufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsDifferent hardware. A chip name or generation does not quantify real-world performance.
Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing.
MSI A520M-A PRO — manufacturer specificationsManufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsCheck the exact configuration and source conditions for your use.
The overclocked speed is MSI's 1DPC 1R maximum; MSI lists 1DPC 2R up to 3866 MHz. JEDEC speeds run up to DDR4-3200. · Manufacturer specification · CPU, BIOS and validated DIMM population determine supported capacity and speeds. DDR4 and DDR5 are not interchangeable.
MSI A520M-A PRO — manufacturer specificationsManufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsCheck the exact configuration and source conditions for your use.
The M.2 slot connects to the CPU. · Manufacturer specification · With Athlon processors with Radeon Vega Graphics the M.2 slot works in SATA mode only. It accepts 2242/2260/2280 drives.
MSI A520M-A PRO — manufacturer specificationsManufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · Wired Ethernet only; MSI lists no Wi-Fi or Bluetooth hardware for this board.
MSI A520M-A PRO — manufacturer specificationsManufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · Manufacturer-listed onboard audio hardware, not a measured sound-quality result. Where alternatives are listed, no particular unseen controller revision is promised.
MSI A520M-A PRO — manufacturer specificationsManufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification · Check MSI's exact CPU support list and its required BIOS. Family support does not confirm the firmware installed on a retail board.
MSI A520M-A PRO — manufacturer specificationsManufacturer specification · Exact CPU support and BIOS revision depend on the processor and the current ASUS CPU support list; the family statement is not a guarantee for every processor.
ASUS PRIME A520M-E/CSM — official UK technical specificationsThese descriptions or measurements differ. Wording alone does not establish a different capability; check the exact configuration.
Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Manufacturer capacity ceiling for this exact board, not included memory or a performance measurement. CPU, BIOS, DIMM population and the validated-module list determine support. DDR4 slots require DDR4 modules; DDR4 and DDR5 are not interchangeable.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Onboard M.2 storage positions only. With Athlon processors with Radeon Vega Graphics, MSI lists SATA mode only for M.2. Supported M.2 lengths are 2242/2260/2280; verify the exact processor support list.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
MSI's rear-panel list for this board does not mention a Flash BIOS button; check the manual if you need BIOS flashback. · Manufacturer specification
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · MSI's datasheet lists EZ Debug LED without the LED count; it is not a numeric POST code display.
MSI A520M-A PRO — exact model datasheetNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Counts do not establish connector current limits.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Requires a processor with integrated graphics; supported modes depend on the CPU.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
MSI labels these memory speeds in MHz (manufacturer notation); they are the rated data rates. · Manufacturer specification · Manufacturer A-XMP/OC limits, not guaranteed stability or measured performance. CPU, BIOS and memory-module compatibility apply.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
MSI lists RAID modes for SATA drives only; NVMe RAID support is not stated. · Manufacturer specification
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · x16 with Ryzen 5000/5000G/4000G/3000; x8 with Ryzen 3000G; x4 with Athlon with Radeon Graphics processors. Check the CPU support list for the exact processor.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. With Athlon processors with Radeon Vega Graphics, MSI lists SATA mode only for M.2. Supported M.2 lengths are 2242/2260/2280; verify the exact processor support list.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification
ASUS PRIME A520M-E/CSM — official UK technical specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · Internal-header capacity; requires compatible case ports and wiring. Not rear-panel sockets.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification · The detailed specification identifies the two rear USB 2.0 ports as Type-A.
MSI A520M-A PRO — manufacturer specificationsNo source recorded for this side.
Evidence is missing or conflicting on at least one side. This is not a verified difference.
1 shared field has the same recorded value.
| Specification | MSI A520M-A PRO | ASUS PRIME A520M-E/CSM |
|---|---|---|
CPU socket SourcesMSI A520M-A PRO Manufacturer specification · Match the exact CPU and required BIOS as well as the physical socket. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | AM4 | AM4 |
ChipsetDifferent SourcesASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | AMD A520 | AMD A520 Chipset |
Form factorDifferent SourcesMSI A520M-A PRO Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | Micro-ATX; 236 × 200 mm | mATX Form Factor 8.9 inch x 8.7 inch ( 22.6 cm x 22.1 cm ) |
CPU support / BIOS sourceDifferent SourcesMSI A520M-A PRO Manufacturer specification · Check MSI's exact CPU support list and its required BIOS. Family support does not confirm the firmware installed on a retail board. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM Manufacturer specification · Exact CPU support and BIOS revision depend on the processor and the current ASUS CPU support list; the family statement is not a guarantee for every processor. ASUS PRIME A520M-E/CSM — official UK technical specifications | AMD Ryzen 5000 / 5000 G-Series / 4000 G-Series / 3000 / 3000 G-Series | AMD Socket AM4 for AMD Ryzen™ 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series/ 3000 G-Series Desktop Processors* *Refer to www.asus.com for CPU support list. BIOS: 256 Mb Flash ROM, UEFI AMI BIOS |
Listed operating systems SourcesMSI A520M-A PRO No source recorded. ASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | Not provided | Windows 11, Windows 10 64-bit |
Memory type, slots and limitDifferent SourcesMSI A520M-A PRO The overclocked speed is MSI's 1DPC 1R maximum; MSI lists 1DPC 2R up to 3866 MHz. JEDEC speeds run up to DDR4-3200. · Manufacturer specification · CPU, BIOS and validated DIMM population determine supported capacity and speeds. DDR4 and DDR5 are not interchangeable. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | 2 DDR4 DIMM slots; dual channel; up to 64 GB; up to DDR4-4600+ (OC); A-XMP; non-ECC unbuffered | 2 x DIMM slots, max. 64GB, DDR4 5100(OC)/ 4866(OC)/ 4666(OC)/ 4600(OC)/ 4466(OC)/ 4400(OC)/ 4333(OC)/ 4266(OC)/ 4200(OC)/ 4133(OC)/ 4000(OC)/ 3866(OC)/ 3733(OC)/ 3600(OC)/ 3466(OC)/ 3400(OC)/ 3333(OC)/ 3200/ 3000/ 2933/ 2800/ 2666/ 2400/ 2133, Un-buffered Memory* Dual Channel Memory Architecture *ECC memory(ECC mode) support varies by CPU. *Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists). |
Maximum listed memory SourcesMSI A520M-A PRO Manufacturer specification · Manufacturer capacity ceiling for this exact board, not included memory or a performance measurement. CPU, BIOS, DIMM population and the validated-module list determine support. DDR4 slots require DDR4 modules; DDR4 and DDR5 are not interchangeable. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | 64 GB | Not provided |
DIMM slots SourcesMSI A520M-A PRO Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | 2 | Not provided |
Memory population OC limits SourcesMSI A520M-A PRO MSI labels these memory speeds in MHz (manufacturer notation); they are the rated data rates. · Manufacturer specification · Manufacturer A-XMP/OC limits, not guaranteed stability or measured performance. CPU, BIOS and memory-module compatibility apply. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | 1DPC 1R: 4600 MHz; 1DPC 2R: 3866 MHz | Not provided |
ECC memory operating mode SourcesMSI A520M-A PRO Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | ECC UDIMM accepted in non-ECC mode | Not provided |
Storage interfacesDifferent SourcesMSI A520M-A PRO The M.2 slot connects to the CPU. · Manufacturer specification · With Athlon processors with Radeon Vega Graphics the M.2 slot works in SATA mode only. It accepts 2242/2260/2280 drives. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | 1 × M.2 PCIe 3.0 x4; M.2 slot also supports SATA; 4 × SATA 6 Gb/s | Total supports 1 x M.2 slot and 4 x SATA 6Gb/s ports AMD Ryzen™ 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series/ 3000 G-Series Desktop Processors M.2 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 & SATA modes) AMD A520 Chipset 4 x SATA 6Gb/s ports Support RAID 0, 1, 10 |
Onboard M.2 storage slots SourcesMSI A520M-A PRO Manufacturer specification · Onboard M.2 storage positions only. With Athlon processors with Radeon Vega Graphics, MSI lists SATA mode only for M.2. Supported M.2 lengths are 2242/2260/2280; verify the exact processor support list. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | 1 | Not provided |
SATA storage ports SourcesMSI A520M-A PRO Manufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. With Athlon processors with Radeon Vega Graphics, MSI lists SATA mode only for M.2. Supported M.2 lengths are 2242/2260/2280; verify the exact processor support list. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | 4 | Not provided |
SATA RAID modes SourcesASUS PRIME A520M-E/CSM No source recorded. | RAID 0/1/10 | Not provided |
Primary PCIe link SourcesMSI A520M-A PRO Manufacturer specification · x16 with Ryzen 5000/5000G/4000G/3000; x8 with Ryzen 3000G; x4 with Athlon with Radeon Graphics processors. Check the CPU support list for the exact processor. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | x16 slot: CPU PCIe 3.0 up to x16 | Not provided |
Secondary expansion links SourcesASUS PRIME A520M-E/CSM No source recorded. | 1 PCIe 3.0 x1 slot | Not provided |
Expansion slots and restrictions SourcesMSI A520M-A PRO No source recorded. ASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | Not provided | AMD Ryzen™ 5000 Series/ 5000 G-Series/ 4000 G-Series/ 3000 Series/ 3000 G-Series Desktop Processors 1 x PCIe 3.0 x16 slot (supports x16 mode) AMD A520 Chipset 2 x PCIe 3.0 x1 slots |
Onboard audio hardwareDifferent SourcesMSI A520M-A PRO Manufacturer specification · Manufacturer-listed onboard audio hardware, not a measured sound-quality result. Where alternatives are listed, no particular unseen controller revision is promised. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | Realtek ALC892 or ALC897 codec; 7.1-channel | Realtek 7.1 Surround Sound High Definition Audio CODEC* - Supports Jack-detection, Multi-streaming, Front Panel Jack-retasking - Supports up to 24-Bit/192 kHz playback Audio Features - Audio Shielding - LED-illuminated audio trace path design - Premium audio capacitors - Dedicated audio PCB layers *A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output. |
Processor-dependent display outputs SourcesMSI A520M-A PRO Manufacturer specification · Requires a processor with integrated graphics; supported modes depend on the CPU. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | HDMI 2.1: up to 4096×2160 at 60 Hz; DVI-D: up to 1920×1200 at 60 Hz | Not provided |
Rear USB ports SourcesMSI A520M-A PRO Manufacturer specification · The detailed specification identifies the two rear USB 2.0 ports as Type-A. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | 2 USB 2.0; 4 USB 5 Gb/s Type-A | Not provided |
Front USB header capacity SourcesMSI A520M-A PRO Manufacturer specification · Internal-header capacity; requires compatible case ports and wiring. Not rear-panel sockets. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | 4 USB 2.0; 2 USB 5 Gb/s | Not provided |
USB ports and headers SourcesMSI A520M-A PRO No source recorded. ASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | Not provided | Rear USB (Total 7 ports) 1 x USB 3.2 Gen 2 port (1 x Type-A) 4 x USB 3.2 Gen 1 ports (4 x Type-A) 2 x USB 2.0 ports (2 x Type-A) Front USB (Total 6 ports) 1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports 2 x USB 2.0 headers support additional 4 USB 2.0 ports |
Rear-panel ports SourcesMSI A520M-A PRO No source recorded. ASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | Not provided | 1 x USB 3.2 Gen 2 port (1 x Type-A) 4 x USB 3.2 Gen 1 ports (4 x Type-A) 2 x USB 2.0 ports (2 x Type-A) 1 x D-Sub port 1 x DVI-D port 1 x HDMI™ port 1 x Realtek RTL8111H 1Gb Ethernet port 3 x Audio jacks 1 x PS/2 Keyboard/Mouse combo port |
Network interfacesDifferent SourcesMSI A520M-A PRO Manufacturer specification · Wired Ethernet only; MSI lists no Wi-Fi or Bluetooth hardware for this board. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | Realtek 8111H 1 Gb Ethernet | 1 x Realtek RTL8111H 1Gb Ethernet |
Fan and pump headers SourcesMSI A520M-A PRO Manufacturer specification · Counts do not establish connector current limits. MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | 1 CPU; 1 system fan header | Not provided |
Diagnostic indicators SourcesMSI A520M-A PRO Manufacturer specification · MSI's datasheet lists EZ Debug LED without the LED count; it is not a numeric POST code display. MSI A520M-A PRO — exact model datasheetASUS PRIME A520M-E/CSM No source recorded. | EZ Debug LED | Not provided |
Internal headers and connectors SourcesMSI A520M-A PRO No source recorded. ASUS PRIME A520M-E/CSM Manufacturer specification ASUS PRIME A520M-E/CSM — official UK technical specifications | Not provided | Fan and cooling related 1 x 4-pin CPU Fan header 1 x 4-pin Chassis Fan header Power related 1 x 24-pin Main Power connector 1 x 8-pin +12V Power connector Storage related 1 x M.2 slot (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports 2 x USB 2.0 headers support additional 4 USB 2.0 ports Miscellaneous 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (AAFP) 1 x S/PDIF Out header 1 x Speaker header 1 x SPI TPM header (14-1pin) 1 x 10-1 pin System Panel header |
NVMe RAID modes SourcesMSI A520M-A PRO MSI lists RAID modes for SATA drives only; NVMe RAID support is not stated. · Manufacturer specification MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | Not provided | Not provided |
|---|---|---|
Rear Flash BIOS button SourcesMSI A520M-A PRO MSI's rear-panel list for this board does not mention a Flash BIOS button; check the manual if you need BIOS flashback. · Manufacturer specification MSI A520M-A PRO — manufacturer specificationsASUS PRIME A520M-E/CSM No source recorded. | Not provided | Not provided |
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Each record represents an explicitly checked model and configuration. Original import: 5 Sept 2026; this is not its verification date. This is not a list of current offers or a popularity ranking.
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