AsRock B550D4-4L ATX Server Motherboard

The AsRock B550D4-4L is an ATX form factor server motherboard built around the AMD B550 chipset and socket AM4 (PGA 1331), supporting AMD Ryzen 5000 and 3000 series desktop processors. At 13.78 x 11.65 in with a 2.76 in packaged height and 3.31 lb shipping weight, it fits standard ATX server chassis and rackmount enclosures used in NVR builds, edge servers, and small-footprint compute nodes where socket AM4 core counts are preferable to a full EPYC platform. The B550D4-4L (often searched as B550D4 4L) targets integrators who need a no-frills, four-LAN server board rather than a consumer desktop motherboard repurposed for always-on duty.

Overview

This board occupies the space between consumer AM4 desktop motherboards and full dual-socket server platforms — a single-socket AM4 board with server-grade I/O built in rather than added through expansion cards. That matters for deployments like video management servers, small NVR hosts, or network edge appliances where you want Ryzen-class single-thread performance but still need multiple isolated network interfaces for management, storage, and camera VLANs without burning PCIe slots on add-in NICs.

Key Features

• AM4 (PGA 1331) socket support for Ryzen 5000/3000 series: gives you a path to 8-core/16-thread desktop-class CPUs at server-friendly cost, useful when a VMS workload needs strong single-core clock speed for real-time transcoding rather than the higher core counts (and higher price) of an EPYC platform.
• B550 chipset: provides PCIe Gen 3 lane routing and chipset-level I/O for storage and expansion without requiring a higher-tier X570 board, keeping the platform cost down for single-socket server builds.
• Quad onboard Gigabit LAN: four physical network interfaces let you segment traffic — for example, one NIC for out-of-band management, one for storage/iSCSI, and two bonded or split across camera VLANs — without consuming PCIe slots on multi-port NIC cards.
• ATX form factor: standard mounting pattern (13.78 x 11.65 in) means it drops into common rackmount and tower server chassis without a proprietary tray, simplifying chassis sourcing for integrators building out network video recorder or edge-compute nodes.
• 2.76 in board height envelope: a factor to check against low-profile 1U/2U chassis clearance before ordering, particularly once RAM heatsinks, a CPU cooler, and add-in cards are stacked above the board.
• 3.31 lb board weight: lighter than dual-socket server boards, which keeps shipping and rack-mounting logistics simple for integrators handling multiple builds at once.

Integration & Compatibility

Because the B550D4-4L uses standard AM4 desktop CPUs rather than server-only silicon, integrators building VMS recording servers can pair it with retail AM4 coolers and standard ATX power supplies, simplifying sourcing versus proprietary server-only platforms. The four onboard Gigabit LAN ports are the standout spec for anyone building network appliances or small recording servers that need physical network segmentation out of the box — pair this board with a managed PoE switch when scaling camera counts, and consult a PoE planning guide when budgeting switch-side power for connected camera runs. For broader platform context on AsRock's board lineup, see the AsRock catalog; for other server and workstation boards in this class, browse the server motherboards category. If you're scoping a full recording server build rather than a bare board, a VMS architecture guide covers how CPU, NIC count, and storage interact for multi-camera deployments.

Frequently Asked Questions

Q: What CPUs does the AsRock B550D4-4L support?

A: It uses an AM4 (PGA 1331) socket and supports AMD Ryzen 5000 series and Ryzen 3000 series desktop processors.

Q: What form factor is the B550D4-4L?

A: It's a standard ATX motherboard measuring 13.78 x 11.65 x 2.76 in, fitting standard ATX server and tower chassis.

Q: How many network ports does the B550D4-4L have?

A: Four onboard Gigabit LAN ports.

Q: How much does the B550D4-4L weigh?

A: 3.31 lb.

Q: Where is the B550D4-4L manufactured?

A: China (country of origin CN).

Ted Perry

What stands out on the B550D4-4L is the quad Gigabit LAN layout — four physical ports on a single-socket AM4 board is not something you see on consumer B550 boards, and it's the reason this model gets specified for server builds instead of a gaming motherboard with a repurposed BIOS.

Technical Highlights:

• AM4 (PGA 1331) socket: supports Ryzen 5000 and 3000 series CPUs, giving you desktop-class single-core performance for real-time video transcoding workloads without EPYC platform cost.
• Four onboard Gigabit LAN ports: lets you physically separate management, storage, and camera network traffic without eating PCIe slots on add-in NIC cards.
• ATX footprint at 13.78 x 11.65 x 2.76 in, 3.31 lb: standard mounting means it drops into common rackmount chassis without a proprietary tray or bracket kit.

Deployment Considerations:

• Confirm your chassis clearance against the 2.76 in board height once a CPU cooler and RAM are installed — this matters more in 1U/2U enclosures than full-height towers.
• Because this uses consumer AM4 CPUs rather than server-only silicon, ECC support and IPMI/remote management availability should be confirmed against your specific build requirements before ordering — those aren't called out in the specs here.

Specify the B550D4-4L when you're building a compact NVR or edge recording server on a Ryzen AM4 platform and need four physically isolated LAN ports for management and camera VLAN segmentation without adding a discrete multi-port NIC.