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Green rectangular circuit board with silver ports and black slots

ASUS

ASUS PRIME B450M-A AMD motherboard AM4 Micro ATX

SKU CH-BZ9C-M23MR

Micro ATX AM4 board with B450 chipset, one PCIe 3.0 x16 slot, DDR4 memory up to 64 GB, USB 3.1 Gen 2 and LAN on the rear I/O

  • CPU Socket TypeAM4
  • ChipsetAMD B450
  • Number of Memory SlotsDDR4
  • Maximum Memory Supported64GB
  • PCI Express 3.0 x161x PCI Express 3.0 x16
  • PCI Express x161
  • AM4 socket ready for listed Ryzen CPUs
  • Micro ATX form factor fits compact builds
  • DDR4 memory support up to 64 GB
  • PCI Express 3.0 x16 slot for graphics cards
  • M.2 slot available for fast storage

AM4 Micro ATX Platform

The ASUS PRIME B450M-A is an AMD B450 chipset motherboard built for the AM4 socket in a Micro ATX form factor. It provides four DDR4 memory slots supporting up to 64GB of system memory. The board includes one PCI Express 3.0 x16 slot and one legacy PCI slot for expansion cards. Rear I/O supplies one LAN port and one USB 3.1 Gen 2 Type-A connector.

VRM Thermal Behaviour

The B450 chipset and AM4 power delivery handle sustained workloads within the board's rated specifications without additional active cooling on the VRM heatsinks. During extended multi-core loads the voltage regulators maintain stable operation for the supported processor list. Builders should ensure case airflow reaches the heatsink area to keep temperatures in check during long rendering or compile sessions.

PCIe 3.0 and M.2 Limits

The single PCI Express 3.0 x16 slot caps graphics and add-in card bandwidth at the 3.0 standard rather than newer revisions. M.2 storage runs over the same PCIe 3.0 lanes, so peak sequential throughput is limited to the chipset's lane allocation and the 3.0 signalling rate. SATA 6Gbps ports remain available for additional drives but do not increase the total PCIe lane budget.

Points forts

  • AM4 socket ready for listed Ryzen CPUs
  • Micro ATX form factor fits compact builds
  • DDR4 memory support up to 64 GB
  • PCI Express 3.0 x16 slot for graphics cards
  • M.2 slot available for fast storage

Caractéristiques

BrandASUS
ModelPRIME B450M-A
CPU Socket TypeAM4
ChipsetAMD B450
Number of Memory SlotsDDR4
Maximum Memory Supported64GB
PCI Express 3.0 x161x PCI Express 3.0 x16
PCI Express x161
PCI Slots1 x PCI Slot
Back I/O Ports1 x LAN (RJ45) / 1 x USB 3.1 Gen 2 Type-A
RJ451 x RJ45
USB 3.11 x USB 3.1
Form FactorMicro ATX

Questions sur cet article

How much power does the ASUS PRIME B450M-A draw when the system runs all day?

The board itself uses only a few watts; total system power depends on the installed Ryzen CPU, DDR4 memory, graphics card and storage drives.

What components must I already own for this motherboard to function?

You need an AM4 Ryzen processor, DDR4 memory modules, a power supply with 24-pin and 4-pin CPU connectors, storage drives with SATA cables, and a case that accepts Micro ATX.

Will my older Ryzen 1600 or 2600 CPU work without a BIOS update?

Yes, first- and second-generation Ryzen CPUs such as the 1600 and 2600 are listed as compatible without a BIOS update.

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