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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

  • ProcessorSupports Intel Xeon E-2400 series and Intel Pentium Gold G74
  • Form factorMicro ATX
  • CPU socketLGA 1700
  • Network speed10 Gbit/s
  • Supported CPU count1
  • Processor detailsThermal Design Power 95 W
  • 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.

How it compares

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

Price $458.99
Pricier than about 77% of the 776 comparable items (median $254.49).

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Specifications

Product
Brand nameAsRock Rack
Model nameEC266D4U-2L2T
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 x M-key (PCIe4.0 x4); support 2280/2260/2242/2230 form factor [PCH]
Graphics
Onboard video chipAspeed AST2600
Connectivity
Network speed10 Gbit/s
Ethernet controllerIntel X710
Second LAN controllerIntel I210
Second LAN speed10/100/1000 Mbit/s
Maximum network speed2 × 10 Gbit/s + 2 × 1 Gbit/s
Ports & slots
PCIe 4.0 x16 slotsSLOT6: PCIe5.0 x16 [CPU]
PCIe x4 slotsSLOT7: PCIe4.0 x4* [CPU]
*SLOT7 share lanes with OCuLink4. OCuLink4 will disable when SLOT7 is populated
PCIe x1 slotsSLOT4: PCIe4.0 x1 [PCH]
Rear panel 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 USB headersUSB 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)
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight1.47 kg
Package size356 × 305 × 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

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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