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Green rectangular ATX server motherboard with silver LGA 1700 socket, four black DDR5 slots, four copper RJ45 ports

ASRock Rack

ASRock Rack EC266D4-4L server motherboard LGA 1700 DDR5 4x 1G LAN

SKU CH-WGQ4-J8Z0E MPN EC266D4-4L

ATX server board with LGA 1700 socket, four DDR5 ECC slots, 14 SATA ports, four 1 GbE ports and IPMI remote management

  • ProcessorSupports Intel Xeon E-2400 series and Intel Pentium Gold G74
  • Form factorATX
  • CPU socketLGA 1700
  • Network speed10/100/1000 Mbit/s
  • Supported CPU count1
  • Processor detailsThermal Design Power 95 W
  • Supports Intel Xeon E-2400 series processors on LGA 1700 socket
  • Four DDR5 288-pin slots with ECC support up to 128 GB
  • Four 1 GbE LAN ports via Intel I210 controllers
  • PCIe 5.0 x16 and x8 slots plus two PCIe 4.0 x4 slots
  • Two M.2 PCIe 4.0 x4 slots supporting 2280/2260/2242/2230 form factors

Server motherboard with four 1 GbE ports

The ASRock Rack EC266D4-4L is an ATX server motherboard built around the Intel C266 chipset and the LGA 1700 socket. It supports a single Intel Xeon E-2400 series processor or an Intel Pentium Gold G7400/G7400T with a thermal design power of 95 W. The board provides four DDR5 288-pin slots running at 4400 MT/s with ECC, up to 128 GB total.

Builders needing four copper 1 GbE links

This board suits systems that require four RJ45 ports driven by Intel I210 controllers and two M.2 connectors each wired for PCIe 4.0 x4. It also delivers one PCIe 5.0 x16 slot, one PCIe 5.0 x8 slot and two PCIe 4.0 x4 slots for add-in cards. Buyers who need 10 GbE or faster onboard networking should consider other platforms.

The shared-lane arrangement between the two top

SLOT6 operates at PCIe 5.0 x16 when SLOT4 is empty, but drops to x8 as soon as SLOT4 is populated. This single constraint decides whether the motherboard can host two full-bandwidth expansion cards simultaneously.

How it compares

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

Price $340.99
Pricier than about 66% of the 776 comparable items (median $254.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameAsRock Rack
Model nameEC266D4-4L
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 2280/2260/2242/2230 form factor [PCH]
1 M-key (PCIe4.0 x4); support 2280/2260/2242/2230 form factor [PCH]
Graphics
Onboard video chipAspeed AST2600
Connectivity
Network speed10/100/1000 Mbit/s
Ethernet controllerIntel I210
Maximum network speed4 × 1 Gbit/s
Ports & slots
PCIe 5.0 x16 slotsSLOT6: PCIe5.0 x16* [CPU]
*SLOT6 share lanes with SLOT4. SLOT6 will switch to x8 when SLOT4 is populated
PCIe x4 slotsSLOT7: PCIe4.0 x4 [CPU]
SLOT2: PCIe4.0 x4 [PCH]
Rear panel ports1 x COM (Serial Port) / 1 x D-Sub / 2 x USB 3.2 Gen 1 Type-A / 4 x LAN (RJ45)
Onboard USB headersUSB 3.2 (Gen1) Header: 2 header (19-pin, 4 USB3.2 Gen1)
USB 2.0 Header: 1 header (9-pin, 2 USB2.0)
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
Shipping weight1.16 kg
Package size356 × 305 × 76 mm
More details
PCI express x8SLOT4: PCIe5.0 x8* [CPU]
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

What are the ATX dimensions of this motherboard?

The board measures 12 inches by 9.6 inches and follows the standard ATX form factor for server chassis mounting.

How do I install the LGA 1700 CPU and DDR5 memory correctly?

Align the processor notches with the socket keys, lower the retention lever gently, then press each DDR5 ECC UDIMM into the 288-pin slots until the side clips click.

Which TPM modules are validated for the 13-pin SPI header?

The qualified list includes Infineon SLB9672VU20 and SLB9670VQ2.0 modules for the onboard TPM SPI connector.

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