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Green Micro-ATX server motherboard with silver sockets and black expansion slots

ASRock Rack

ASRock Rack EC266D4U-2L2T server motherboard

SKU CH-TRH3-MF7Z1 MPN EC266D4U-2L2T

Micro-ATX server board with LGA 1700 socket for Xeon E-2400 series, four DDR5 ECC slots to 128 GB, PCIe 5.0 x16, four OCuLinks, M.2 and dual 10 GbE

  • 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
  • Single Xeon E-2400 socket delivers up to 95W TDP performance
  • Four DDR5 ECC UDIMM slots support 128GB maximum capacity
  • PCIe 5.0 x16 slot provides maximum GPU or accelerator bandwidth
  • Four OCuLink connectors enable flexible storage expansion
  • Dual 10GbE Intel X710 ports handle high-throughput network traffic

Single-socket server board

The ASRock Rack EC266D4U-2L2T is a Micro-ATX server motherboard built around the Intel C266 chipset and an LGA 1700 socket. It accepts one Intel Xeon E-2400 series processor or a Pentium Gold G7400/G7400T with a 95 W thermal envelope. Four DDR5 288-pin slots support ECC UDIMMs up to 128 GB at 4400 MT/s.

Builders needing one CPU and ECC memory

This board suits integrators assembling compact single-socket servers or workstations that require ECC memory and 10 GbE networking. It does not suit builds that need dual-socket scaling, more than four memory channels, or additional full-length PCIe slots beyond the single x16 and x4 connectors.

One PCIe 5.0 x16 slot from the CPU

The primary expansion slot delivers PCIe 5.0 x16 bandwidth directly from the processor, while a second slot provides PCIe 4.0 x4 and shares lanes with an OCuLink port. Four OCuLink connectors and one M.2 slot complete the high-speed I/O.

Highlights

  • Single Xeon E-2400 socket delivers up to 95W TDP performance
  • Four DDR5 ECC UDIMM slots support 128GB maximum capacity
  • PCIe 5.0 x16 slot provides maximum GPU or accelerator bandwidth
  • Four OCuLink connectors enable flexible storage expansion
  • Dual 10GbE Intel X710 ports handle high-throughput network traffic

Specifications

BrandAsRock Rack
ModelEC266D4U-2L2T
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 4.0 x16SLOT6: PCIe5.0 x16 [CPU]
PCI Express x4SLOT7: PCIe4.0 x4* [CPU]
*SLOT7 share lanes with OCuLink4. OCuLink4 will disable when SLOT7 is populated
PCI Express x1SLOT4: PCIe4.0 x1 [PCH]
Other Slots1 OCuLink (PCIe4.0 x4)* [CPU]
1 OCuLink (PCIe4.0 x4 or 4 SATA 6Gb/s) [PCH]
2 OCuLink (PCIe4.0 x4) [PCH]
*OCulink4 shares lanes with SLOT7 and will be disabled when SLOT7 is populated
M.21 x M-key (PCIe4.0 x4); support 2280/2260/2242/2230 form factor [PCH]
Onboard Video ChipsetAspeed AST2600
LAN ChipsetIntel X710
LAN Speed10Gbps
Second LAN ChipsetIntel I210
Second LAN Speed10/100/1000Mbps
Max LAN Speed2 x 10Gbps + 2 x 1Gbps
Back I/O Ports1 x COM (Serial Port) / 1 x D-Sub / 2 x LAN (RJ45) / 2 x SFP28 / 2 x USB 3.2 Gen 1 Type-A
Onboard USBUSB 3.2 (Gen1) Header: 1 header (19-pin, 2 USB3.2 Gen1)
USB 2.0 Header: 1 header (9-pin, 2 USB2.0)
Type A USB 2.0 Port: 1 vertical Type-A (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, LAN1/LAN2 activity LED, locate, SMBus
System Panel: 1 (9-pin): power switch, reset switch, system power LED, HDD activity LED
VGA header: 1
Speaker Header: 1 (4-pin)
Buzzer: 1
Fan Header: 7 (4-pin)
Thermal Sensor Header: 1
TPM Header: 1 (13-pin, SPI)
SGPIO Header: 1
SMBus header: 1
PMBus header: 1
IPMB Header: 1
Clear CMOS: 1 (contact pads)
Front Lan LED Connector: 1
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 FactorMicro ATX
Dimensions (W x L)9.6" x 9.6"
Shipping weight1.47 kg
Package size356 × 305 × 76 mm

Questions about this item

Will the DDR5 ECC UDIMM modules need to be replaced when I exceed 128 GB?

The board supports a maximum of 128 GB across four slots, so any capacity increase beyond that would require a different motherboard.

Which expansion slot becomes unavailable first when I add a card to the PCIe 4.0 x4 slot?

Populating SLOT7 disables OCuLink4 because they share the same CPU lanes.

How much heat does the 95 W TDP processor generate during continuous operation?

The supported CPUs have a 95 W thermal design power, which determines the cooling capacity you must provide for sustained loads.

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