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Green Micro-ATX server board with dual SFP28 ports

ASRock Rack

ASRock Rack B650D4U3-2L2Q/BCM server motherboard

SKU CH-1XC5-WEVWY MPN B650D4U3-2L2Q/BCM

Micro-ATX server board for AMD EPYC 4004/4005 and Ryzen 9000/8000/7000 CPUs, four DDR5 ECC slots up to 192 GB, one PCIe 5.0 x16, one M.2 5.0 x4, dual 25 GbE SFP28 plus dual 1 GbE

  • ProcessorSupports AMD EPYC 4004 and AMD Ryzen 9000/8000/7000 Series P
  • Form factorDeep Micro-ATX
  • Network speed25 Gbit/s
  • Supported CPU count1
  • Processor detailsThermal Design Power Up to 170 W by proper cooling solution
  • ChipsetAMD B650E
  • Supports AMD EPYC 4004 and Ryzen 9000/8000/7000 processors for flexible compute choices
  • Four DDR5 slots with ECC support deliver up to 192GB reliable memory capacity
  • Dual 25GbE SFP28 ports via Broadcom BCM57502 enable high-speed server networking
  • PCIe 5.0 x16 and PCIe 5.0 M.2 provide fast expansion for GPUs and storage
  • Micro-ATX 9.6" form factor fits dense chassis while retaining full server features

Micro-ATX EPYC and Ryzen server board

The ASRock Rack B650D4U3-2L2Q/BCM is a Micro-ATX server motherboard built for AMD EPYC 4004, 4005 and Ryzen 9000, 8000, 7000 series processors. It fits single-socket systems that need ECC memory and high-speed networking in a compact footprint.

Suits single-CPU servers needing 25GbE and ECC

Builders assembling storage nodes, edge appliances or virtualisation hosts with one processor will match the board's feature set. Buyers who want more storage than four SATA ports provide, or who need multi-processor scaling, should look at something else.

Dual 25GbE SFP28 decides the network fit

Onboard Broadcom BCM57502 gives two 25Gbps SFP28 links plus two 1Gbps RJ45 ports from an Intel I210 controller. If the deployment requires fibre uplinks at 25GbE this board matches; otherwise a 1GbE-only board covers the same basics.

How it compares

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

Price $363.99
Pricier than about 70% of the 776 comparable items (median $254.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameAsRock Rack
Model nameB650D4U3-2L2Q/BCM
Processor
ProcessorSupports AMD EPYC 4004 and AMD Ryzen 9000/8000/7000 Series Processors
Supported CPU count1
Processor detailsThermal Design Power Up to 170 W by proper cooling solution
ChipsetAMD B650E
Memory
RAM slots4 x DDR5 288-pin
Supported memoryDDR5 5600
Max supported RAM192 GB
ECC supportYes
Storage
M.2 slotsM2_1 (PCIe5.0 x4), supports 2280/2242 form factor [CPU]
Graphics
Onboard video chipAspeed AST2600
Connectivity
Network speed25 Gbit/s
Ethernet controllerBroadcom BCM57502
Second LAN controllerIntel I210
Second LAN speed10/100/1000 Mbit/s
Maximum network speed2 × 25 Gbit/s + 2 × 1 Gbit/s
Ports & slots
PCIe 5.0 x16 slotsSLOT6: PCIe5.0 x16 [CPU]
PCIe x4 slotsSLOT4: PCIe4.0 x4 [FCH]
PCIe x1 slotsSLOT7: PCIe4.0 x1 [FCH]
Rear panel ports1 x COM (Serial Port) / 1 x D-Sub / 1 x HDMI / 2 x LAN (RJ45) / 2 x SFP28 / 4 x USB 3.2 Gen 1 Type-A
Onboard USB headersUSB 3.2 (Gen1) Header: 1 (19-pin, 2 USB3.2 Gen1)
USB 2.0 Header: 1 (9-pin, 2 USB2.0)
Size & build
Form factorDeep Micro-ATX
Width and length9.6 in × 9.6 in
Shipping weight1.16 kg
Package size305 × 279 × 76 mm
More details
BIOSAMI UEFI BIOS; 256Mb (32 MB) SPI Flash ROM
Plug and Play, ACPI 6.4 compliance wake up events, SMBIOS 3.5

Questions about this item

How do I install the AMD EPYC 4004 or Ryzen processor into the SP5 socket, and what step is most often missed?

Align the triangle on the CPU with the socket corner, lower the retention frame, then torque the captive screws in a cross pattern to the specified pressure; the step most often missed is applying the correct mounting pressure for the 170W TDP cooler bracket.

What maintenance or replacement will the DDR5 ECC UDIMM memory need over time?

The four 288-pin slots support up to 192GB of DDR5 5600 ECC UDIMM; modules only need replacement if a correctable error count exceeds the platform threshold or a DIMM fails POST, otherwise no scheduled swap is required.

What thermal limit appears first when the 25GbE Broadcom BCM57502 SFP28 ports run sustained line-rate traffic?

The SFP28 transceiver modules typically hit their case-temperature threshold before the Broadcom BCM57502 controller does, so adequate chassis airflow over the cage assemblies is the first practical limit.

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