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Deep mini-ITX server motherboard, green PCB, silver I/O shield, LGA 1700 socket, four DDR5 slots, PCIe 5.0 x16, dual 10GbE RJ45, VGA

ASRock Rack

ASRock Rack EC266D4ID-2T/X550 server motherboard

SKU CH-K7MY-RZVY9 MPN EC266D4ID-2T/X550

Deep mini-ITX server motherboard with LGA 1700 socket, four DDR5 ECC slots, PCIe 5.0 x16, dual 10GbE LAN, three OCuLink ports and two M.2 slots

  • ProcessorSupports Intel Xeon E-2400 series and Intel Pentium Gold G74
  • Form factorDeep mini-ITX
  • CPU socketLGA 1700
  • Network speed10 Gbit/s
  • Supported CPU count1
  • Processor detailsThermal Design Power 95 W
  • Deep mini-ITX form factor fits dense 6.7" x 8.2" chassis
  • Supports Intel Xeon E-2400 series and Pentium Gold G7400 processors
  • Four DDR5 288-pin slots deliver up to 128GB ECC memory
  • PCIe 5.0 x16 slot plus three OCuLink ports for flexible storage expansion
  • Dual Intel X550 10GbE ports provide high-speed network connectivity

Deep mini-ITX server motherboard

The ASRock Rack EC266D4ID-2T/X550 is a deep mini-ITX server motherboard measuring 6.7" x 8.2". It uses the Intel C266 chipset and LGA 1700 socket to support one Intel Xeon E-2400 series or Intel Pentium Gold G7400/G7400T processor up to 95W TDP. The board targets builders who need a compact platform with dual 10GbE and multiple storage links.

Installation notes and common issues

The deep mini-ITX footprint fits standard mini-ITX mounting holes but extends deeper, so verify chassis clearance before fitting. Four 288-pin DDR5 slots accept ECC UDIMMs; populate all four only with validated modules from the QVL to avoid training failures. Three OCuLink connectors share bandwidth with SATA ports, so plan drive topology to prevent lane conflicts.

Storage and network capacity

Dual Intel X550 controllers deliver two 10Gbps RJ45 ports for high-throughput networking. Storage connectivity includes one PCIe 5.0 x16 slot, three OCuLink interfaces providing up to eight SATA 6Gb/s ports, and two M.2 2280 slots wired for PCIe 4.0 x4. Maximum memory capacity is 128GB across four DDR5 4400 slots.

How it compares

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

Price $374.99
Pricier than about 71% of the 776 comparable items (median $254.49).

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Specifications

Product
Brand nameAsRock Rack
Model nameEC266D4ID-2T/X550
Processor
ProcessorSupports Intel Xeon E-2400 series and Intel Pentium Gold G7400/G7400T processors
CPU socketLGA 1700
Supported CPU count1
Processor detailsThermal Design Power 95 W
ChipsetIntel C266
Memory
RAM slots4 x DDR5 288-pin
Supported memoryDDR5 4400
Max supported RAM128 GB
ECC supportYes
Storage
M.2 slots1 M-key (PCIe4.0 x4); support 2280 form factor [PCH]
1 M-key (PCIe4.0 x4); support 2280 form factor [CPU]
Graphics
Onboard video chipAspeed AST2600
Connectivity
Network speed10 Gbit/s
Ethernet controllerIntel X550
Maximum network speed2 × 10 Gbit/s
Ports & slots
PCIe 5.0 x16 slotsSLOT1: PCIe5.0 x16 [CPU]
Additional slots1 OCuLink (PCIe4.0 x4) [PCH]
1 OCuLink (PCIe4.0 x4 or 4 SATA 6Gb/s) [PCH]
1 OCuLink (PCIe3.0 x4 or 4 SATA 6Gb/s) [PCH]
Rear panel ports1 x D-Sub / 2 x LAN (RJ45) / 2 x USB 3.2 Gen 1 Type-A
Onboard USB headersUSB 3.2 (Gen1) Header: 1 header (19-pin, 2 USB3.2 Gen1)
Size & build
Form factorDeep mini-ITX
Width and length6.7 in × 8.2 in
Shipping weight0.91 kg
Package size267 × 216 × 76 mm
More details
BIOSAMI 256Mb SPI Flash ROM
Plug and Play, ACPI 6.4 and above compliance wake up events, SMBIOS 2.8 and above, ASRock Rack Instant Flash

Questions about this item

How can I verify the ASRock Rack EC266D4ID-2T/X550 is working correctly after installation?

Check that the Aspeed AST2600 video outputs a signal through the D-Sub port and that both Intel X550 10Gbps LAN ports show link lights when cables are connected.

What comes in the box with the EC266D4ID-2T/X550 and what must I purchase separately?

The motherboard includes one USB 3.2 Gen1 19-pin header; you must buy an LGA 1700 Xeon E-2400 or Pentium Gold G7400 CPU, DDR5 4400 ECC UDIMMs up to 128 GB, and storage drives for the M.2 and OCuLink connectors.

Which DDR5 capacity should I choose for the four 288-pin slots on this board?

The board supports up to 128 GB total; validated modules include 16 GB, 32 GB and 48 GB DDR5 4800 RDIMMs, so populate all four slots with matching capacities to reach your target.

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