ASUS Prime B550-PLUS AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX Motherboard
Bottom line: The ASUS Prime B550-PLUS AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX ($181.85 on Amazon as of 2026-10-06): PCIe 4.0 x16 SafeSlot plus a PCIe 4.0 x4 M.2 for full-speed Gen 4 GPU and SSD; main trade-off: 1Gb LAN only, so no 2.5Gb Ethernet at a time rivals include it.
As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Pros & Cons
Pros
- ✓ PCIe 4.0 x16 SafeSlot plus a PCIe 4.0 x4 M.2 for full-speed Gen 4 GPU and SSD
- ✓ Dual M.2 slots mean no drive-swapping when you add a second NVMe
- ✓ ECC memory support is rare at B550 and useful for workstation builds
- ✓ Thunderbolt 3 header leaves an upgrade path most B550 ATX boards skip
Cons
- ✗ 1Gb LAN only, so no 2.5Gb Ethernet at a time rivals include it
- ✗ No onboard Wi-Fi or Bluetooth, so add a PCIe or USB adapter
- ✗ DisplayPort is 1.2, capping integrated-graphics output at 4K@60Hz
- ✗ Thunderbolt 3 is a header, not a port, and needs a separate add-in card
Manufacturer description
You get a PCIe 4.0 x16 SafeSlot for your graphics card plus dual M.2 slots, one running PCIe 4.0 x4 for next-generation NVMe SSD speeds. Connectivity covers 1Gb LAN, USB 3.2 Gen 2 Type-A, HDMI 2.1, DisplayPort 1.2 at 4K@60Hz, and a Thunderbolt 3 header if you want to expand later. Thermals are handled by a VRM heatsink, chipset heatsink, and hybrid fan headers tuned through the Fan Xpert 2 utility. ASUS OptiMem trace layout helps memory kits hit higher frequencies at lower voltages, and ECC memory support is on the list for workstation-leaning builds. 5X Protection III adds LANGuard, DRAM…
SpecPicks Verdict
SpecPicks scored ASUS Prime B550-PLUS AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX… 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 ASUS Prime B550-PLUS support Ryzen 5000 CPUs out of the box?
ASUS lists this board as built for Zen 3 Ryzen 5000 and 3rd Gen AMD Ryzen CPUs on the AM4 socket. BIOS revision varies by manufacturing date, so check the product listing or the ASUS CPU support page for your specific chip.
How many M.2 slots does it have, and are they PCIe 4.0?
There are two M.2 slots for NVMe SSDs. One runs at PCIe 4.0 x4 for full Gen 4 drive speeds; the second M.2 slot runs at the lower spec, so put your fastest drive in the Gen 4 slot.
Does the Prime B550-PLUS have built-in Wi-Fi?
No. Networking is wired 1Gb LAN with ASUS LANGuard surge protection. If you need wireless, plan for a PCIe Wi-Fi card or a USB adapter alongside the board.
Can I run ECC memory in this board?
Yes, ECC memory support is listed for this board. ASUS OptiMem trace layout also helps memory kits run at higher frequencies with lower voltages, so check the QVL on the product listing for validated kits.
Key Features
- AMD AM4 Socket and PCIe 4. 0: The perfect pairing for Zen 3 Ryzen 5000 & 3rd Gen AMD Ryzen CPUs
- Ultrafast Connectivity: 1x PCIe4. 0 x16 SafeSlot, 1Gb LAN, dual M. 2 slots (NVMe SSD)—one with PCIe 4. 0 x4 connectivity, USB 3. 2 Gen 2 Type-A , HDMI 2. 1, 4K@60HZ, DisPlay port 1. 2 and Thunderbolt 3 header
- Comprehensive Cooling: VRM heatsink, chipset heatsink, hybrid fan headers and Fan Xpert 2 utility
- 5X Protection III: all-round protection with LANGuard, DRAM overcurrent protection, overvoltage protection, SafeSlot Core safeguards and stainless-steel back I/O
- Boosted Memory Performance: ASUS OptiMem proprietary trace layout allows memory kits to operate at higher frequencies with lower voltages to maximize system performance.
Full Specifications
| Brand | ASUS |
|---|---|
| USB 2.0 | 2 |
| Platform | Windows 10 |
| CPU Model | 1.2GHz Cortex A8 Processor |
| CPU Socket | Socket AM4 |
| Model Name | PRIME B550-PLUS |
| Chipset Type | AMD B550 |
| Connectivity | USB |
| Model Number | PRIME B550-PLUS |
| Item Type Name | ASUS Prime B550-PLUS AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX Motherboard (PCIe 4.0, ECC Memory, 1Gb LAN, HDMI 2.1, DisPlayPort 1.2 (4K@60HZ), Addressable Gen 2 RGB Header and Aura Sync) |
| Mfr Part Number | PRIME B550-PLUS |
| Number of Ports | 4 |
| Total Usb Ports | 14 |
| Processor Socket | Socket AM4 |
| Total PCIe Ports | 1 |
| Total SATA Ports | 6 |
| 5X Protection III | all-round protection with LANGuard, DRAM overcurrent protection, overvoltage protection, SafeSlot Core safeguards and stainless-steel back I/O |
| Compatible Devices | Personal Computer |
| Memory Clock Speed | 2133 MHz |
| Warranty Description | 3 YEARS |
| Full listing title | ASUS Prime B550-PLUS AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX Motherboard (PCIe 4.0, ECC Memory, 1Gb LAN, HDMI 2.1, DisPlayPort 1.2 (4K@60HZ), Addressable Gen 2 RGB Header and Aura Sync). |
Ready to buy?
ASUS Prime B550-PLUS AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX Motherboard (PCIe 4.0, ECC Memory, 1Gb LAN, HDMI 2.1, DisPlayPort 1.2 (4K@60HZ), 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 2026-10-06. Price and availability subject to change.
Related Motherboards
More guides & deep dives from the SpecPicks archive
Browse all articles & guides →- Emulation Hardware in 2026: FPGA, Software, and Cart-Reader Ecosystems
- Best 1440p Gaming GPUs in 2026
- Best Budget Gaming PC Build 2026 — ~$1,000 ($800 on Sale)
- Best Retro Handhelds in 2026 — From $35 to $500
- How to Build a Windows 98 Retro PC in 2026
- RTX 4070 Super vs RX 7800 XT — Which to Buy in 2026
- The Complete Voodoo5 5500 AGP Driver Guide (2026 Edition)
More reviews from the SpecPicks archive
Browse all reviews →- Best Budget NVMe SSD for a Big Steam Library: WD Blue SN550 vs SATA
- Can a 12GB RTX 3060 Run a 70B LLM? The Offload Reality Check
- Best Budget SATA SSD for a Steam Game Library in 2026
- Modern PC Builds vs Period-Correct Retro Rigs: A 2026 Comparison
- Best NVIDIA RTX 3060 Graphics Cards in 2026: 5 AIB Picks Compared
- Anthropic Extends Free Fable 5 as GPT-5.6 Sol Heats Pricing War
- Best IDE-to-USB Adapter for Retro PC Data Recovery: FIDECO vs Unitek vs Vantec
- Best Parts for a Local LLM Box That Also Runs Jellyfin in 2026
- 16% of Freelance Jobs Are Now AI-Doable: The Local Agent Rig That Runs Them
- Best Raspberry Pi Setup for Home Assistant in 2026
- Local LLM Hardware in 2025: Picking GPUs, CPUs & RAM
- Intel Arc AI Image Generator: 2025 Setup & Performance Guide
- llama.cpp on Snapdragon Hexagon NPU: First Real Benchmarks and What Actually Works
- Best Streaming and Podcasting Gear for 2026: 5 Picks for Mic, Light, and Monitoring
- Best PC and Console Game Controller in 2026
- RTX 5090 Benchmark Comparison: 4K Gaming, AI & Value (2026)
- Radeon Pro W7900 48GB vs RTX A6000 48GB for Local 70B Inference (2026)
- Best USB Microphone for Discord and Office Calls Under $200 (2026)
- CompactFlash as a Win98 Boot Drive: Transcend CF133 + IDE Adapter Walkthrough
- Is the Ryzen 7 5800X Still Worth It for 1440p Gaming in 2026?
- Play Retro Games in Your Browser: Best Emulators 2025
- The Sound Blaster Monopoly: How Creative Owned Every PC — and What to Buy Now
- Ryzen 7 5800X3D Hard to Find: DDR5 CPU Alternatives Worth It?
- Cosmos3-Super on an RTX 3060 12GB: Can the #1 Open-Weights Image Model Run Local?
Earliest SpecPicks reviews
Browse full archive →- Best GPU for Llama 3.1 8B (2026)
- Best GPU for Qwen 3 14B (2026)
- Best GPU for Qwen 3 32B (2026)
- Best GPU for Llama 3.1 70B (2026)
- Best GPU for DeepSeek-R1 32B (2026)
- Best GPU for Llama 3.1 405B (2026)
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 14B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 70B on NVIDIA GeForce RTX 5090
- How to run DeepSeek-R1 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 4090