ASUS
ASUS Prime B650M-A AX II AMD B650 AM5 Ryzen™ Desktop 9000 8000 & 7000 Micro-ATX mATX Motherboard, DDR5, PCIe 5.0 M.2, 2.5Gb LAN, Wi-Fi 6, DisplayPort, HDMI®, USB 3.2, USB 3.2 Type-C®, BIOS Flashback™
Status: ASUS Prime B650M-A AX II AMD B650 AM5 Ryzen™…: Unavailable on Amazon as of . SpecPicks has no in-stock listing with matching specs on file; the search below lists current offers. eBay sellers may still list this model new or used.
Bottom line: The ASUS Prime B650M-A AX II AMD B650 AM5 Ryzen™ Desktop 9000 8000 & 7000: AM5 socket covers Ryzen 9000, 8000, and 7000 Series CPUs on one board; main trade-off: BIOS update may be required before Ryzen 9000 or 8000 Series CPUs will post.
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Currently unavailable on Amazon. Not the same product — 3 in-stock alternatives:
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Pros & Cons
Pros
- ✓ AM5 socket covers Ryzen 9000, 8000, and 7000 Series CPUs on one board
- ✓ PCIe 5.0 M.2 slot ready for next-gen NVMe drives
- ✓ Realtek 2.5Gb Ethernet plus Wi-Fi 6 built in, no add-in card needed
- ✓ BIOS FlashBack updates firmware with no CPU or RAM installed
- ✓ OptiMem II trace routing targets higher DDR5 memory overclocks
Cons
- ✗ BIOS update may be required before Ryzen 9000 or 8000 Series CPUs will post
- ✗ Micro-ATX layout means fewer expansion slots than full ATX B650 boards
- ✗ DDR5 only, so existing DDR4 kits cannot carry over from an AM4 build
- ✗ Aura Sync RGB headers add cost for builders who want no lighting
Manufacturer description
The ASUS Prime B650M-A AX II puts a full AM5 platform into a Micro-ATX footprint, so you can build a compact Ryzen 7000, 8000, or 9000 Series system without giving up modern connectivity. ASUS pairs the B650 chipset with DDR5 support tuned by OptiMem II trace routing, which preserves signal integrity for higher memory clocks, and a PCIe 5.0 M.2 slot for next-generation NVMe drives. Networking is handled by Realtek 2.5Gb Ethernet plus Wi-Fi 6, a combination that keeps LAN transfers and wireless latency in check for gaming and streaming. Cooling is not an afterthought either: VRM and PCH…
SpecPicks Verdict
SpecPicks scored ASUS Prime B650M-A AX II AMD B650 AM5 Ryzen™ Desktop 9000 8000 &… using a rating × review-volume × price-fit model applied to published specs and reviews across the motherboards category. ASUS's motherboards lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for motherboards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Will this board work with a Ryzen 9800X3D or other Ryzen 9000 CPU?
Yes, the AM5 socket supports Ryzen 9000, 8000, and 7000 Series desktop processors. ASUS notes a BIOS update may be required for 9000 and 8000 Series chips, and BIOS FlashBack handles that without a CPU installed.
Does the ASUS Prime B650M-A AX II support DDR4 memory?
No. This is a DDR5 board, and AM5 boards do not accept DDR4. ASUS OptiMem II trace and via routing is included to preserve signal integrity for DDR5 memory overclocking.
Is there a PCIe 5.0 M.2 slot for an SSD?
Yes, the board includes an M.2 slot running at PCIe 5.0, alongside USB 3.2 Gen 2 rear ports and a front-panel USB 3.2 Gen 1 Type-C header.
What networking does this motherboard include?
Realtek 2.5Gb Ethernet for wired connections and Wi-Fi 6 for wireless, so you do not need a separate network card or USB Wi-Fi adapter.
Can I update the BIOS without a CPU installed?
Yes. BIOS FlashBack works by copying the UEFI BIOS file to a FAT32 USB stick, plugging it into the BIOS FlashBack port, and pressing the button. It runs with no memory or CPU installed.
Key Features
- AM5 Socket: Ready for AMD Ryzen Desktop 9000*, 8000*, and 7000 Series Processors
- *BIOS Update maybe required when used with AMD Ryzen Desktop 9000 and 8000 Series CPU Processors
- Ultrafast Connectivity: M.2 PCIe 5.0, Realtek 2.5Gb Ethernet, USB 3.2 Gen 2 ports, front USB 3.2 Gen 1 Type-C
- ASUS OptiMem II: Careful routing of traces and vias, plus ground layer optimizations to preserve signal integrity for improved memory overclocking
- Comprehensive Cooling: VRM heatsink, PCH heatsink, hybrid fan headers and Fan Xpert 2+
- Aura Sync RGB Lighting: Onboard Addressable Gen 2 headers and Aura RGB header for RGB LED strips, easily synced with Aura Sync-capable hardware
Full Specifications
| Brand | ASUS |
|---|---|
| Platform | Windows |
| AM5 Socket | Ready for AMD Ryzen Desktop 9000*, 8000*, and 7000 Series Processors |
| CPU Socket | Socket AM5 |
| Model Name | PRIME B650M-A AX II |
| Chipset Type | AMD B650 |
| ASUS OptiMem II | Careful routing of traces and vias, plus ground layer optimizations to preserve signal integrity for improved memory overclocking |
| Compatible Devices | Personal Computer |
| Memory Clock Speed | 6400 MHz |
| Compatible Processors | AMD 1st Gerenration Ryzen |
| Comprehensive Cooling | VRM heatsink, PCH heatsink, hybrid fan headers and Fan Xpert 2+ |
| RAM Memory Technology | DDR5 |
| Aura Sync RGB Lighting | Onboard Addressable Gen 2 headers and Aura RGB header for RGB LED strips, easily synced with Aura Sync-capable hardware |
| Ultrafast Connectivity | M.2 PCIe 5.0, Realtek 2.5Gb Ethernet, USB 3.2 Gen 2 ports, front USB 3.2 Gen 1 Type-C |
| Memory Storage Capacity | 128 GB |
Ready to buy?
ASUS Prime B650M-A AX II AMD B650 AM5 Ryzen™ Desktop 9000 8000 & 7000 Micro-ATX mATX Motherboard, DDR5, PCIe 5.0 M.2, 2.5Gb LAN, Wi-Fi 6, DisplayPort, HDMI®, USB 3.2, USB 3.2 Type-C®, BIOS Flashback™ is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
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