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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

  • CPU Socket TypeLGA 1700
  • CPU TypeSupports Intel Xeon E-2400 series and Intel Pentium Gold G74
  • Number of Processor Support1
  • CPU FeaturesThermal Design Power 95W
  • North BridgeIntel C266
  • Memory Slots4 x DDR5 288-pin
  • 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.

Highlights

  • 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

Specifications

BrandAsRock Rack
ModelEC266D4ID-2T/X550
CPU Socket TypeLGA 1700
CPU TypeSupports Intel Xeon E-2400 series and Intel Pentium Gold G7400/G7400T processors
Number of Processor Support1
CPU FeaturesThermal Design Power 95W
North BridgeIntel C266
Memory Slots4 x DDR5 288-pin
Memory StandardDDR5 4400
Maximum Memory Supported128GB
ECC SupportedYes
PCI Express 5.0 x16SLOT1: PCIe5.0 x16 [CPU]
Other 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]
M.21 M-key (PCIe4.0 x4); support 2280 form factor [PCH]
1 M-key (PCIe4.0 x4); support 2280 form factor [CPU]
Onboard Video ChipsetAspeed AST2600
LAN ChipsetIntel X550
LAN Speed10Gbps
Max LAN Speed2 x 10Gbps
Back I/O Ports1 x D-Sub / 2 x LAN (RJ45) / 2 x USB 3.2 Gen 1 Type-A
Onboard USBUSB 3.2 (Gen1) Header: 1 header (19-pin, 2 USB3.2 Gen1)
Other ConnectorsPower Connector: 1 Mirco-Fit (4-pin, ATX PSU signal) w/ ATX 24-pin adapter cable, 2 (8-pin, ATX 12V) support 12V DC-in
Other Power Connectors: 1 SATA-Power (4-pin)
Auxiliary Panel Header: 1 (18-pin): chassis intrusion, system fault LED, LAN1/LAN2 activity LED, locate, SMBus
System Panel: 1 (9-pin): power switch, reset switch, system power LED, HDD activity LED
COM Header: 1 (9-pin)
Fan Header: 3 (4-pin)
TPM Header: 1 (13-pin, SPI)
SGPIO Header: 1
SMBus header: 1
PMBus header: 1
IPMB Header: 1
Clear CMOS: 1 (2-pin)
Others: 1 NCSI (9-pin)
NMI Header: 1
BIOS FeatureAMI 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
Form FactorDeep mini-ITX
Dimensions (W x L)6.7" x 8.2"
Shipping weight0.91 kg
Package size267 × 216 × 76 mm

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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