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Rectangular green Micro-ATX server board with silver sockets, black expansion slots, dual RJ45 ports, VGA, HDMI, DisplayPort

ASRock Rack

ASRock Rack B650D4U Micro-ATX server motherboard

SKU CH-3DFW-39B80

Micro-ATX server board with single AM5 socket for AMD EPYC 4004 and Ryzen 7000/8000/9000 CPUs, four DDR5 ECC UDIMM slots, PCIe 5.0 x16 and x4 slots, dual 1 GbE LAN, IPMI, and four SATA ports

  • CPU Socket TypeSingle Socket AM5 (LGA 1718)
  • CPU TypeSupports AMD EPYC 4004 and AMD Ryzen 8000/7000 Series Proces
  • Number of Processor Support1
  • CPU FeaturesThermal Design Power: Up to 170W by proper cooling solution
  • North BridgeAMD B650E
  • Memory Slots4 DIMM slots (2DPC) DDR5 288-pin ECC/non-ECC UDIMM
  • Supports AMD EPYC 4004 and Ryzen 9000/8000/7000 series processors via single AM5 LGA 1718 socket
  • Four DDR5 288-pin DIMM slots accept ECC or non-ECC UDIMMs up to 48 GB each
  • PCIe 5.0 x16 and x4 slots plus PCIe 4.0 x1 provide high-speed expansion capacity
  • Dual M.2 slots with PCIe 5.0 x4 and PCIe 4.0 x4 support 2280 and 2242 form factors
  • Dual 1 GbE Intel i210 LAN ports and dedicated IPMI Realtek RTL8211F enable remote management

Micro-ATX server board for AMD EPYC 4004

This Micro-ATX motherboard fits a single LGA 1718 socket and accepts AMD EPYC 4004 or Ryzen 9000, 8000 and 7000 series processors with a thermal design power up to 170 W. Four DDR5 288-pin DIMM slots support ECC or non-ECC UDIMM modules up to 48 GB each. The board targets builders who need server-grade features in a compact 9.6-inch square form factor.

Thermals noise and power draw in normal use

Processor power delivery is rated for up to 170 W when paired with a proper cooling solution, so thermal performance will depend on the chosen cooler and chassis airflow. The onboard Aspeed AST2600 video controller and dual Intel i210 1 GbE controllers operate at low power, while the single Realtek RTL8211F management LAN adds minimal load. No active cooling components are integrated on the board itself, leaving acoustic profile entirely to the system integrator.

DDR5 ECC UDIMM support up to 48 GB per slot

Memory runs at 5200 MHz with one DIMM per channel and at 3600 MHz when both channels are populated, and ECC is supported across all four slots. This capacity ceiling determines whether the platform can hold the dataset or virtual-machine count a given workload requires. Builders who need larger per-module densities or registered DIMM support must select a different platform.

Highlights

  • Supports AMD EPYC 4004 and Ryzen 9000/8000/7000 series processors via single AM5 LGA 1718 socket
  • Four DDR5 288-pin DIMM slots accept ECC or non-ECC UDIMMs up to 48 GB each
  • PCIe 5.0 x16 and x4 slots plus PCIe 4.0 x1 provide high-speed expansion capacity
  • Dual M.2 slots with PCIe 5.0 x4 and PCIe 4.0 x4 support 2280 and 2242 form factors
  • Dual 1 GbE Intel i210 LAN ports and dedicated IPMI Realtek RTL8211F enable remote management

Specifications

BrandAsRock Rack
ModelB650D4U
CPU Socket TypeSingle Socket AM5 (LGA 1718)
CPU TypeSupports AMD EPYC 4004 and AMD Ryzen 8000/7000 Series Processors
Number of Processor Support1
CPU FeaturesThermal Design Power: Up to 170W by proper cooling solution
North BridgeAMD B650E
Memory Slots4 DIMM slots (2DPC)
DDR5 288-pin ECC/non-ECC UDIMM
Memory Standard5200 MHz (1DPC); 3600 MHz (2DPC)
Maximum Memory SupportedMax. Capacity per DIMM: 48GB
ECC SupportedYes
PCI Express 5.0 x16SLOT6: PCIe5.0 x16 [CPU]
PCI Express x4SLOT7: PCIe5.0 x4 [CPU]
PCI Express x1SLOT4: PCIe4.0 x1 [FCH]
SATA4 x SATA 6.0Gb/s
M.21 M-key (PCIe5.0 x4), supports 2280/2242 form factor [CPU]
1 M-key (PCIe4.0 x4), supports 2280/2242 form factor [FCH]
Onboard Video ChipsetAspeed AST2600
LAN ChipsetIntel i210: 2 RJ45 (1GbE)
1 Realtek RTL8211F for dedicated management GLAN
LAN Speed10/100/1000Mbps
Back I/O PortsUID Button/LED: 1 UID button w/ LED
VGA Port: 1 DB15 (VGA), 1 DisplayPort, 1 HDMI
Serial Port: 1 DB9 (COM)
USB 3.2 Gen1 Port: 4 Type-A (USB3.2 Gen1)
RJ45: 2 RJ45 (1GbE), 1 dedicated IPMI
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 (6-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)
Form FactorMicro ATX
Dimensions (W x L)9.6" x 9.6"

Questions about this item

How do I install the CPU into the LGA 1718 socket without bending pins?

Align the gold triangle on the processor with the matching corner of the socket, lower the chip straight down without pressure, then close the retention lever until it clicks; the lever does the seating force so you never push the CPU yourself

What component will need replacement first during long-term operation?

System fans connected to the board headers are the first moving parts to wear out; plan to swap them when noise or RPM drop appears

Which thermal limit appears first when the EPYC 4004 or Ryzen runs sustained loads?

The board is rated for processors up to 170 W TDP with proper cooling; if the cooler cannot dissipate that heat the CPU will throttle before any other component hits its limit

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