ASUS ROG Strix B550-A Gaming AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX Gaming Motherboard (PCIe 4.0, 2.5Gb LAN, BIOS Flashback, Dual M.2 with heatsinks, Addressable Gen 2 RGB Header and Aura Sync
Bottom line: The ASUS ROG Strix B550-A Gaming AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ($242.79 on Amazon as of 2026-10-26 22:13 UTC): 12+2 DrMOS power stages handle Ryzen 9 5900X-class chips; main trade-off: B550 chipset: no PCIe 4.0 on the second M.2 or chipset lanes.
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*Price sourced from Amazon.com. Last updated 2026-10-26. Price and availability subject to change.
Pros & Cons
Pros
- ✓ 12+2 DrMOS power stages handle Ryzen 9 5900X-class chips
- ✓ 2.5 Gb LAN with LANGuard instead of standard gigabit
- ✓ Dual M.2 with heatsinks, one at PCIe 4.0 x4
- ✓ BIOS Flashback updates firmware with no CPU installed
Cons
- ✗ B550 chipset: no PCIe 4.0 on the second M.2 or chipset lanes
- ✗ No onboard Wi-Fi; needs a PCIe or USB adapter
- ✗ Thunderbolt 3 is a header only, not a rear port
- ✗ AM4 socket is end-of-life; no AM5 Ryzen 7000 upgrade path
Manufacturer description
The ROG Strix B550-A Gaming is ASUS's ATX AM4 board for builders pairing a Ryzen 5000 or 3rd Gen Ryzen CPU with PCIe 4.0 storage and graphics. Its 12+2 DrMOS power stage array, alloy chokes, and Stack Cool 3+ layout are built to hold high-core-count Ryzen chips steady under sustained load, so you are not throttling a 5800X or 5900X on VRM temperature during long sessions. Networking runs on 2.5 Gb LAN with ASUS LANGuard surge protection rather than the usual gigabit port. You get dual M.2 slots with heatsinks, one wired PCIe 4.0 x4 for full-speed NVMe, plus USB 3.2 Gen 2 Type-C and a…
SpecPicks Verdict
SpecPicks scored ASUS ROG Strix B550-A Gaming AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen… using a rating × review-volume × price-fit model applied to published specs and reviews across the motherboards category. Compare with similarly-priced alternatives in the motherboards category before committing. 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
Does the ROG Strix B550-A Gaming support Ryzen 5000 CPUs?
Yes. The AM4 socket supports Zen 3 Ryzen 5000 and 3rd Gen Ryzen processors. If the board ships with older firmware, BIOS Flashback lets you update without a CPU installed.
Does this motherboard have built-in Wi-Fi?
No. The B550-A Gaming provides 2.5 Gb wired Ethernet with ASUS LANGuard but no onboard wireless. Plan for a PCIe or USB Wi-Fi adapter if you need it.
How many M.2 slots does it have, and are they PCIe 4.0?
Two M.2 slots, both with heatsinks. One runs PCIe 4.0 x4 off the CPU for full-speed NVMe drives; the second runs at the B550 chipset's lower bandwidth.
Will it fit my case?
It is a standard ATX motherboard, so any ATX or larger case with matching standoffs will accept it. Check the product listing for exact board dimensions.
What video outputs are on the rear panel?
HDMI 2.1 at 4K 60Hz and DisplayPort 1.2. These only work with a Ryzen APU that has integrated graphics; with a CPU like the 5800X you need a discrete GPU.
Key Features
- AMD AM4 Socket and PCIe 4. 0: The perfect pairing for Zen 3 Ryzen 5000 and 3rd Gen AMD Ryzen CPUs.Audio: Supports up to 32-Bit/192kHz playback
- Robust Power Design: 12 plus 2 DrMOS power stages with high-quality alloy chokes and durable capacitors provide reliable power for the last AMD high-count-core CPUs
- High-performance Gaming Networking: 2.5 Gb LAN with ASUS LANGuard
- Best Gaming Connectivity: Supports HDMI 2.1(4K at 60HZ) and DisplayPort 1.2 output, featuring dual M.2 slots (NVMe SSD)—one with PCIe 4.0 x4 connectivity, USB 3.2 Gen 2 Type-C port and Thunderbolt 3 header
- Industry-leading Gaming Audio and AI Noise Cancelling Mic Technology: High fidelity audio from a SupremeFX S1220A codec with DTS Sound Unbound and Sonic Studio III draws you deeper into the action. Communicate clearly with ASUS AI Noise Cancelling Mic technology.
Full Specifications
| Brand | ASUS |
|---|---|
| USB 2.0 | 2 |
| Platform | Windows 10 |
| CPU Model | Ryzen 5 |
| CPU Socket | Socket AM4 |
| Model Name | ROG STRIX B550-A GAMING |
| Chipset Type | AMD B550 |
| Connectivity | USB |
| Model Number | ROG Strix B550-A Gaming |
| Item Type Name | ASUS ROG Strix B550-A Gaming AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX Gaming Motherboard (PCIe 4.0, 2.5Gb LAN, BIOS Flashback, Dual M.2 with heatsinks, Addressable Gen 2 RGB Header and Aura Sync |
| Mfr Part Number | ROG Strix B550-A Gaming |
| Number of Items | 1 |
| Number of Ports | 5 |
| Total Usb Ports | 8 |
| Processor Socket | Socket AM4 |
| Total PCIe Ports | 6 |
| Total SATA Ports | 6 |
| Compatible Devices | Personal Computer |
| Memory Clock Speed | 2666 MHz |
| Robust Power Design | 12 plus 2 DrMOS power stages with high-quality alloy chokes and durable capacitors provide reliable power for the last AMD high-count-core CPUs |
Benchmark data for other processors
Ready to buy?
ASUS ROG Strix B550-A Gaming AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX Gaming Motherboard (PCIe 4.0, 2.5Gb LAN, BIOS Flashback, Dual M.2 with heatsinks, Addressable Gen 2 RGB Header and Aura Sync 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.
*Price sourced from Amazon.com. Last updated 2026-10-26. Price and availability subject to change.
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