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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

  • CPU TypeSupports AMD EPYC 4004 and AMD Ryzen 9000/8000/7000 Series P
  • Number of Processor Support1
  • CPU FeaturesThermal Design Power Up to 170W by proper cooling solution
  • North BridgeAMD B650E
  • Memory Slots4 x DDR5 288-pin
  • Memory StandardDDR5 5600
  • 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.

Highlights

  • 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

Specifications

BrandAsRock Rack
ModelB650D4U3-2L2Q/BCM
CPU TypeSupports AMD EPYC 4004 and AMD Ryzen 9000/8000/7000 Series Processors
Number of Processor Support1
CPU FeaturesThermal Design Power Up to 170W by proper cooling solution
North BridgeAMD B650E
Memory Slots4 x DDR5 288-pin
Memory StandardDDR5 5600
Maximum Memory Supported192GB
ECC SupportedYes
PCI Express 5.0 x16SLOT6: PCIe5.0 x16 [CPU]
PCI Express x4SLOT4: PCIe4.0 x4 [FCH]
PCI Express x1SLOT7: PCIe4.0 x1 [FCH]
M.2M2_1 (PCIe5.0 x4), supports 2280/2242 form factor [CPU]
Onboard Video ChipsetAspeed AST2600
LAN ChipsetBroadcom BCM57502
LAN Speed25Gbps
Second LAN ChipsetIntel I210
Second LAN Speed10/100/1000Mbps
Max LAN Speed2 x 25Gbps + 2 x 1Gbps
Back I/O 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 USBUSB 3.2 (Gen1) Header: 1 (19-pin, 2 USB3.2 Gen1)
USB 2.0 Header: 1 (9-pin, 2 USB2.0)
Other ConnectorsPower Connector: 1 (24-pin, ATX main power), 2 (8-pin, ATX 12V)
Auxiliary Panel Header: 1 (18-pin): chassis intrusion, system fault LED, LAN activity LED
System Panel: 1 (9-pin): power switch, reset switch, system power LED, HDD activity LED
VGA header: 1
Speaker Header: 1
Buzzer: 1
Fan Header: 7 (6pin) co-lay 7 (4-pin)
TPM Header: 1 (13-pin, SPI)
SMBus header: 1
PMBus header: 1
IPMB Header: 1
Clear CMOS: 1
Others: 1 (3-pin, 80 debug port header)
Front Lan LED Connector: 1
BIOS FeatureAMI UEFI BIOS; 256Mb (32MB) SPI Flash ROM
Plug and Play, ACPI 6.4 compliance wake up events, SMBIOS 3.5
Form FactorDeep Micro-ATX
Dimensions (W x L)9.6" x 9.6"
Shipping weight1.16 kg
Package size305 × 279 × 76 mm

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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