Global manufacturer specification · PRIME A520M-R
PRIME A520M-R motherboard, identified in the ASUS Global catalogue. Specifications below retain the manufacturer’s configuration and interface conditions.
Specifications checked 17 Oct 2026.
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Manufacturer specificationsAM4 · Micro-ATX · DDR4 · board-only configuration · MSI global specification
A compact Micro-ATX AM4 motherboard with AMD B450: two DDR4 slots (up to 64 GB, DDR4-4133 OC), a PCIe 3.0 x16 graphics slot, one M.2 slot and Realtek 8125BG 2.5 Gb Ethernet.
Specifications checked 21 Sept 2026.
Amazon links open search results. Check the exact variant, current price and availability with the retailer.
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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.
5 verified differences, most decision-relevant first. All are also drawn in Visual facts above. Missing information stays separate.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical specificationsManufacturer specification
MSI B450M-A PRO MAX II — manufacturer specificationsDifferent hardware. A chip name or generation does not quantify real-world performance.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical specificationsManufacturer specification · CPU, BIOS and validated DIMM population determine supported capacity and speeds. DDR4 and DDR5 are not interchangeable.
MSI B450M-A PRO MAX II — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical specificationsM2_1 connects to the CPU. · Manufacturer specification · M2_1 accepts 2280/2260/2242 drives.
MSI B450M-A PRO MAX II — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical specificationsMSI's specification page lists a Realtek 8125 2.5 Gbps LAN controller and a 2.5G LAN rear port, and the model datasheet names the Realtek 8125BG. An older section of MSI's page that listed a Realtek 8111H Gigabit controller conflicts with both and no longer appears on the page. · Manufacturer specification · Wired Ethernet only; no Wi-Fi or Bluetooth module is listed for this board.
MSI B450M-A PRO MAX II — manufacturer specificationsMSI B450M-A PRO MAX II — exact model datasheetCheck the exact configuration and source conditions for your use.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical specificationsManufacturer specification · Manufacturer-listed onboard audio hardware, not a measured sound-quality result. Where alternatives are listed, no particular unseen controller revision is promised.
MSI B450M-A PRO MAX II — manufacturer specificationsCheck the exact configuration and source conditions for your use.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical specificationsManufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing.
MSI B450M-A PRO MAX II — manufacturer specificationsThese descriptions or measurements differ. Wording alone does not establish a different capability; check the exact configuration.
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-R — official Global technical specificationsManufacturer 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 B450M-A PRO MAX II — manufacturer specificationsMSI B450M-A PRO MAX II — exact model datasheetThese descriptions or measurements differ. Wording alone does not establish a different capability; check the exact configuration.
No source recorded for this side.
Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
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 B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Onboard M.2 storage positions only. Verify drive type and CPU support for the M.2 slot. No additional storage slot is inferred from a PCIe expansion connector.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Electrical links and physical connectors are separate; no measured performance is inferred.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
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 B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical 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 · Board headers, not supplied fans or an assertion of current limits.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Requires integrated CPU graphics; supported modes depend on processor.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical 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 · Manufacturer OC configurations, not guaranteed kit speed or measured application performance. CPU, BIOS, memory rank and DIMMs per channel determine support.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
MSI lists RAID modes for SATA drives only; NVMe RAID support is not stated. · Manufacturer specification
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical 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 · Not a measured graphics performance result.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical 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 · SATA 6 Gb/s connectors, not supplied drives or power cables. Verify drive type and CPU support for the M.2 slot. No additional storage slot is inferred from a PCIe expansion connector.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
Manufacturer specification
ASUS PRIME A520M-R — official Global technical 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 · Requires compatible case ports and cabling; not rear sockets.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
No source recorded for this side.
Manufacturer specification · Port inventory and interface ratings, not simultaneous measured throughput or charging power.
MSI B450M-A PRO MAX II — manufacturer specificationsEvidence is missing or conflicting on at least one side. This is not a verified difference.
1 shared field has the same recorded value.
| Specification | ASUS PRIME A520M-R | MSI B450M-A PRO MAX II |
|---|---|---|
CPU socket SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II Manufacturer specification · Match the exact CPU and required BIOS as well as the physical socket. MSI B450M-A PRO MAX II — manufacturer specifications | AM4 | AM4 |
ChipsetDifferent SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II Manufacturer specification MSI B450M-A PRO MAX II — manufacturer specifications | AMD A520 Chipset | AMD B450 |
Form factor and dimensionsDifferent SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing. MSI B450M-A PRO MAX II — manufacturer specifications | micro-ATX Form Factor 9.3 inch x 7.6 inch ( 23.6 cm x 19.3 cm ) | Micro-ATX; 236 × 200 mm |
CPU support and BIOS requirementsDifferent SourcesASUS PRIME A520M-R 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-R — official Global technical specificationsMSI B450M-A PRO MAX II 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 B450M-A PRO MAX II — manufacturer specificationsMSI B450M-A PRO MAX II — exact model datasheet | 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: 128 Mb Flash ROM, UEFI AMI BIOS | AMD Ryzen 5000 / 5000 G-Series / 4000 G-Series / 3000 / 3000 G-Series / 2000 / 2000 G-Series / 1000 Series and Athlon with Radeon Vega Graphics |
Listed operating systems SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II No source recorded. | Windows® 11, Windows® 10 64-bit | Not provided |
Memory type, slots and limitDifferent SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II Manufacturer specification · CPU, BIOS and validated DIMM population determine supported capacity and speeds. DDR4 and DDR5 are not interchangeable. MSI B450M-A PRO MAX II — manufacturer specifications | 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. * Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information site or visit https://www.asus.com/support/. | 2 DDR4 DIMM slots; dual channel; up to 64 GB; up to DDR4-4133 (OC); A-XMP; non-ECC unbuffered |
Maximum listed memory SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II 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 B450M-A PRO MAX II — manufacturer specifications | Not provided | 64 GB |
DIMM slots SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | 2 |
Published memory OC configurations SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · Manufacturer OC configurations, not guaranteed kit speed or measured application performance. CPU, BIOS, memory rank and DIMMs per channel determine support. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | A-XMP OC settings listed through DDR4-4133 |
ECC module operating mode SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · ECC modules run in non-ECC mode, so error correction is not active. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | ECC UDIMM supported in non-ECC mode |
Storage interfaces and restrictionsDifferent SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II M2_1 connects to the CPU. · Manufacturer specification · M2_1 accepts 2280/2260/2242 drives. MSI B450M-A PRO MAX II — manufacturer specifications | 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 * AMD RAIDXpert2 Technology supports both PCIe RAID 0/1/10 and SATA RAID 0/1/10. | 1 × M.2 PCIe 3.0 x4; M2_1 also supports SATA; 4 × SATA 6 Gb/s |
Onboard M.2 storage slots SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · Onboard M.2 storage positions only. Verify drive type and CPU support for the M.2 slot. No additional storage slot is inferred from a PCIe expansion connector. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | 1 |
SATA storage ports SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. Verify drive type and CPU support for the M.2 slot. No additional storage slot is inferred from a PCIe expansion connector. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | 4 |
SATA RAID modes SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · Requires compatible drives and array configuration; no data protection guarantee. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | RAID 0/1/10 |
Expansion slots and restrictions SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II No source recorded. | 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 1 x PCIe 3.0 x1 slot - To ensure compatibility of the device installed, please refer to https://www.asus.com/support/ for the list of supported peripherals. | Not provided |
Primary expansion-slot link SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · Not a measured graphics performance result. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | PCI_E1: CPU PCIe 3.0 up to x16 |
Secondary expansion slots SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · Electrical links and physical connectors are separate; no measured performance is inferred. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | 1 PCIe 2.0 x1 slot |
USB ports and headers SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II No source recorded. | Rear USB (Total 6 ports) 4 x USB 5Gbps ports (4 x Type-A) 2 x USB 2.0 ports (2 x Type-A) Front USB (Total 6 ports) 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports | Not provided |
Rear-panel ports SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II No source recorded. | 4 x USB 5Gbps ports (4 x Type-A) 2 x USB 2.0 ports (2 x Type-A) 1 x HDMI™ port 1 x Realtek 1Gb Ethernet port 3 x Audio jacks 1 x PS/2 keyboard (purple) port 1 x PS/2 mouse (green) port | Not provided |
Audio interfacesDifferent SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II 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 B450M-A PRO MAX II — manufacturer specifications | 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 - 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. | Realtek ALC897 codec; 7.1-channel |
Processor-dependent display outputs SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · Requires integrated CPU graphics; supported modes depend on processor. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | HDMI 2.0b: up to 4K 60 Hz; DVI-D: 1920×1200 at 60 Hz |
Rear USB ports SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · Port inventory and interface ratings, not simultaneous measured throughput or charging power. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | 2 USB 2.0; 4 USB 5 Gb/s Type-A |
Front USB header capacity SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · Requires compatible case ports and cabling; not rear sockets. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | 4 USB 2.0; 2 USB 5 Gb/s Type-A |
Network interfaces and requirementsDifferent SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II MSI's specification page lists a Realtek 8125 2.5 Gbps LAN controller and a 2.5G LAN rear port, and the model datasheet names the Realtek 8125BG. An older section of MSI's page that listed a Realtek 8111H Gigabit controller conflicts with both and no longer appears on the page. · Manufacturer specification · Wired Ethernet only; no Wi-Fi or Bluetooth module is listed for this board. MSI B450M-A PRO MAX II — manufacturer specificationsMSI B450M-A PRO MAX II — exact model datasheet | 1 x Realtek 1Gb Ethernet | Realtek 8125BG 2.5 Gb Ethernet |
Cooling headers SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II Manufacturer specification · Board headers, not supplied fans or an assertion of current limits. MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | 1 CPU; 1 system fan header |
Internal headers and connectors SourcesASUS PRIME A520M-R Manufacturer specification ASUS PRIME A520M-R — official Global technical specificationsMSI B450M-A PRO MAX II No source recorded. | 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 4-pin +12V Power connector Storage Related 1 x M.2 slot (Key M) 4 x SATA 6Gb/s ports USB 1 x USB 5Gbps header supports 2 additional USB 5Gbps ports 2 x USB 2.0 headers support 4 additional USB 2.0 ports Miscellaneous 1 x Clear CMOS header 1 x COM Port header 1 x Front Panel Audio header (F_AUDIO) 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 | Not provided |
NVMe RAID modes SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II MSI lists RAID modes for SATA drives only; NVMe RAID support is not stated. · Manufacturer specification MSI B450M-A PRO MAX II — manufacturer specifications | Not provided | Not listed by the manufacturer |
|---|---|---|
Rear Flash BIOS button SourcesASUS PRIME A520M-R No source recorded. MSI B450M-A PRO MAX II 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 B450M-A PRO MAX II — manufacturer specifications | Not provided | Not listed by the manufacturer |
Closest motherboards to this pair by shared key specifications. Not a popularity ranking.
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.
