ASUS Prime B450M-A II AM4 Micro ATX Motherboard: features and what it fits

The ASUS Prime B450M-A II is a Micro ATX motherboard with an AM4 socket for AMD Ryzen processors. It is the part of a PC that every other component plugs into, and this model suits compact to mid-sized builds or upgrades of an existing AM4 system. This overview explains what its listed features mean and what to confirm before buying.

Which processors it fits

The AM4 socket supports AMD Ryzen 5000, 3rd, 2nd and 1st generation Ryzen processors, according to ASUS. Compatibility depends on the BIOS version on the board, because older BIOS versions may not recognise newer chips. That is where BIOS Flashback comes in. It is a feature that lets you update the BIOS from a USB drive using a dedicated button, typically without a processor or memory installed. It is useful when a board was made before the processor you want to use. Check ASUS's CPU support list for this exact model.

Memory

The board takes DDR4 memory, up to 128GB, with overclocking support listed up to 4400 MHz. Overclocked memory speeds depend on the modules and the processor, so treat 4400 as the ceiling rather than the usual result. Most users run their memory at its rated speed.

Storage and networking

There is M.2 support for NVMe solid-state drives, which are much faster than SATA drives and need no cables. The board has 1GB Ethernet (that is, Gigabit Ethernet) for wired networking, and USB 3.2 Gen 2 Type-A for fast external drives. Wi-Fi is not listed, so a wireless card or adapter would be needed for Wi-Fi.

Video outputs

For processors with integrated graphics, the board offers HDMI 2.0b, DVI and D-Sub (VGA) outputs. HDMI 2.0b typically supports 4K at 60Hz. These ports only work with CPUs that include graphics; Ryzen chips without integrated graphics need a separate graphics card.

Cooling, protection and lighting

ASUS lists a VRM heatsink and a PCH heatsink to help with heat, and Fan Xpert 2+ for controlling fan speeds. The 5X Protection III label covers several hardware safeguards for system protection. An onboard connector supports RGB LED strips, and Aura Sync lets compatible lighting match across components.

Size and weight: the board measures about 9.6 x 9.4 inches and weighs 1.3 lb (0.6 kg), which is the Micro ATX size.

Who it suits

It suits people building or upgrading an AM4 desktop with a Ryzen processor, and especially compact builds in cases that accept Micro ATX. A Micro ATX board has fewer expansion slots than a full-size ATX board, so people who want several add-in cards would typically look at a larger one.

What to check before you buy

• CPU and BIOS: confirm your exact Ryzen model is supported and whether a BIOS update is needed first.
• Case size: Micro ATX fits Micro ATX and ATX cases, but check your case specification.
• Memory: DDR4 is not interchangeable with DDR5; check your modules.
• Wireless: add a Wi-Fi card if you need wireless.
• Graphics: if your CPU has no integrated graphics, plan for a graphics card.
• Power connectors: check your power supply has the connectors listed in the manual.

The short version

• A Micro ATX AM4 motherboard for Ryzen 5000, 3rd, 2nd and 1st generation processors.
• DDR4 up to 128GB, with overclocking support to 4400 MHz.
• M.2 support, Gigabit Ethernet and USB 3.2 Gen 2 Type-A.
• HDMI 2.0b, DVI and D-Sub video outputs.
• BIOS Flashback, VRM and PCH heatsinks, Fan Xpert 2+ and Aura Sync RGB support.

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