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Green ATX server motherboard with silver AM4 socket four black DDR4 slots silver PCIe x16 slot four black RJ45 ports blue HDMI port

ASRock Rack

ASRock Rack B550D4-4L server motherboard AM4 DDR4 3200 4×288-pin ATX 12.0×9.6″

SKU CH-YX9H-BVHMV MPN B550D4-4L

ATX server motherboard with AM4 socket, four DDR4 3200 ECC slots, PCIe 4.0 x16 and x8, six SATA 6.0 Gb/s, one M.2 22110/2280/2242, four Intel i210 1 GbE ports plus dedicated IPMI.

  • ProcessorSupports: AMD Ryzen 5000 and 4000 G-Series Desktop Processor
  • Form factorATX
  • CPU socketSocket AM4
  • Number of DDR4 slots4 × 288-pin
  • DDR4 memory supportDDR4 3200
  • PCIe 4.0 x16 slotsSLOT6: PCIe x16 (PCIe4.0 x16) [CPU]
  • Supports AMD Ryzen 5000, 4000 G-Series and 3000 series desktop processors on AM4 socket
  • Four 288-pin DDR4 3200 slots with ECC and non-ECC UDIMM support
  • One PCIe 4.0 x16 plus one PCIe 4.0 x4 expansion slot for add-in cards
  • Six SATA 6.0Gb/s ports with RAID 0, 1, 10 and one M.2 supporting 22110, 2280, 2242
  • Four Intel i210 1GbE RJ45 ports plus dedicated IPMI LAN and Aspeed AST2500 video

ATX Server Motherboard AM4

The ASRock Rack B550D4-4L is an ATX server motherboard built around the AMD B550 chipset for Socket AM4 processors. It accepts Ryzen 5000, 4000 G-Series, 3000 and matching PRO series desktop CPUs. Four 288-pin DDR4 slots support ECC and non-ECC UDIMMs at 3200 MT/s. A single PCIe 4.0 x16 slot and one PCIe 4.0 x4 slot wired as x8 provide expansion for GPU or accelerator cards.

Suits ECC memory builds not multi-GPU

This board suits builders who need ECC UDIMM support, four 1GbE Intel i210 ports plus a dedicated IPMI lane, and an Aspeed AST2500 BMC for remote management. Six SATA 6.0Gb/s ports with RAID 0/1/10 and one M-key M.2 slot accepting 22110, 2280 or 2242 drives cover storage. It is not for systems that require more than one full-length PCIe 4.0 x16 slot or 10GbE networking onboard.

Single PCIe 4.0 x16 slot decides fit

The single PCIe 4.0 x16 slot from the CPU is the specification that decides whether this motherboard fits the build. Only one add-in card can run at full x16 bandwidth; the second slot operates at x4 electrical. If the workload needs two x16 devices or a second x16 physical slot, a different platform is required.

How it compares

Measured against everything we stock in Server & Workstation Boards, at today’s prices. Recalculated every night.

Price $271.99
Typical for this category: the median of 776 items is $254.49.

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Specifications

Product
Brand nameAsRock Rack
Model nameB550D4-4L
Processor
CPU socketSocket AM4
Memory
DDR4 memory supportDDR4 3200
ECC supportYes
Storage
SATA ports6 x SATA 6.0Gb/s
SATA and RAID support0/1/10
M.2 slots1 M-key (PCIe3.0 x4 or SATA 6Gb/s); support 22110/2280/2242 form factor [FCH]
Graphics
Onboard video chipAspeed AST2500
Connectivity
Ethernet controller4 Intel i210: 4 RJ45 (1GbE)
Maximum network speed1 Gbit/s
Ports & slots
Number of DDR4 slots4 × 288-pin
PCIe 4.0 x16 slotsSLOT6: PCIe x16 (PCIe4.0 x16) [CPU]
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
Shipping weight1.18 kg
Package size356 × 296 × 70 mm
More details
PCI express x8SLOT4: PCIe x8 (PCIe4.0 x4) [CPU]

Questions about this item

How do I install the CPU into the Socket AM4 (PGA 1331) and what is the step people often miss?

Lift the retention arm, align the gold triangle on the Ryzen processor with the socket marker, lower the CPU without force, then lock the arm; the step often missed is removing the plastic protective cover from the socket before insertion.

What maintenance will the Aspeed AST2500 management controller need later?

The AST2500 provides the dedicated IPMI LAN and VGA output; its only serviceable part is the coin cell that keeps the BMC clock and settings — replace it when the system loses time or IPMI settings after power loss.

Which limit appears first when the PCIe 4.0 x16 slot (SLOT6) runs a sustained heavy workload?

The slot is wired for PCIe 4.0 x16 from the CPU; the first limit under sustained load is the thermal envelope of the installed add-in card and the chassis airflow available to dissipate its heat.

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