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Green Micro-ATX server board with silver CPU socket, four black DDR4 slots, three PCIe slots, two M.2 sockets, eight SATA ports

ASRock Rack

ASRock Rack E3C256D4U-2L2T server motherboard

SKU CH-Z66K-JQX8W MPN E3C256D4U-2L2T

Micro-ATX server motherboard supporting Intel Xeon E-2300 or 10th Gen Pentium CPUs with four DDR4 ECC slots, dual 10GbE and dual 1GbE LAN, eight SATA ports, plus two M.2 and three PCIe expansion slots

  • ProcessorSupports Intel Xeon E-2300 and 10th Gen Intel Pentium series
  • Form factorMicro ATX
  • CPU socketSingle Socket H5 (LGA1200)
  • Network speed10 Gbit/s
  • Supported CPU count1
  • ChipsetIntel C256
  • Supports Intel Xeon E-2300 and 10th Gen Intel Pentium processors
  • 4 DDR4 DIMM slots with ECC and non-ECC UDIMM support up to 32GB each
  • Dual 10GbE and dual 1GbE LAN ports for high-speed networking
  • 8 SATA 6Gb/s ports with RAID 0/1/5/10 support
  • Two M.2 slots and three PCIe slots including PCIe 4.0 x16

Micro-ATX server board for single-socket Xeon

The ASRock Rack E3C256D4U-2L2T fits Micro-ATX chassis and accepts one LGA1200 processor from the Intel Xeon E-2300 or 10th Gen Pentium families. Four DDR4 DIMM slots support ECC or non-ECC UDIMM up to 32 GB each. Dual 10 GbE and dual 1 GbE ports handle segregated traffic without extra cards.

Sustained-load behaviour with PCIe lane allocation

Under continuous throughput the primary x16 and x4 slots run at PCIe 4.0 speeds when a Xeon E-2300 CPU is installed, while 10th Gen Pentium processors limit the x16 slot to PCIe 3.0 and disable the x4 slot. The Aspeed AST2500 provides constant remote management video independent of the main GPU. Eight SATA 6 Gb/s ports with RAID 0, 1, 5, 10 maintain steady array performance during rebuilds.

LGA1200 socket decides processor compatibility

Only Intel Xeon E-2300 and 10th Gen Pentium series CPUs listed in the vendor support list will operate on this board. Builders needing other socket types or newer processor generations must select a different motherboard.

How it compares

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

Price $385.99
Pricier than about 72% of the 776 comparable items (median $254.49).

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Specifications

Product
Brand nameAsRock Rack
Model nameE3C256D4U-2L2T
Processor
ProcessorSupports Intel Xeon E-2300 and 10th Gen Intel Pentium series processors
CPU socketSingle Socket H5 (LGA1200)
Supported CPU count1
ChipsetIntel C256
Memory
Max supported RAMMax. Capacity per DIMM: ECC/non-ECC UDIMM: up to 32 GB
Storage
SATA ports8 x SATA 6.0Gb/s
SATA and RAID support0/1/5/10
M.2 slots1 M-key* (PCIe3.0 x4 or SATA 6Gb/s); support 22110/2280/2260 form factor [PCH]
1 M-key (PCIe3.0 x4); support 2280/2260 form factor [PCH]
*SATA0 will be disabled when M2_1 populated with SATA device
Graphics
Onboard video chipAspeed AST2500
Connectivity
Network speed10 Gbit/s
Ethernet controllerIntel X710-AT2: 2 RJ45 (10GbE)
Second LAN controllerIntel i210: 2 RJ45 (1GbE)
Second LAN speed10/100/1000 Mbit/s
Maximum network speed10 Gbit/s
Ports & slots
Number of DDR4 slots4 DIMM slots (2DPC)
PCIe 4.0 x16 slotsSLOT6: PCIe4.0* x16 [CPU]
*When installing 10th Gen Intel Pentium Series Processors, SLOT6 supports PCIe3.0 only and SLOT4 will not function
PCIe x4 slotsSLOT4: PCIe4.0* x4 [CPU]
PCIe x1 slotsSLOT7: PCIe3.0 x1 [PCH]
Rear panel ports1 DB15, 1 DB9, 4 Type-A (USB3.2 Gen1), 2 RJ45 (10GbE), 2 RJ45 (1GbE), 1 HDMI, 1 dedicated IPMI LAN port
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight1.09 kg
Package size305 × 287 × 71 mm

Questions about this item

How much power does the Aspeed AST2500 video chipset draw during continuous operation?

The Aspeed AST2500 is a low-power management controller; its draw is a small fraction of the board total, which is dominated by the installed Xeon E-2300 or Pentium processor and DDR4 memory population.

Which processor and memory must I supply for this LGA1200 board to POST?

You need one Intel Xeon E-2300 or 10th Gen Pentium CPU plus at least one DDR4 288-pin ECC or non-ECC UDIMM up to 32 GB per slot.

Will my existing PCIe 3.0 x8 RAID card work in the PCIe 4.0 x16 slot when I keep a 10th Gen Pentium CPU?

With a 10th Gen Pentium the x16 slot runs at PCIe 3.0 speeds, so a PCIe 3.0 x8 card will function normally; the x4 slot is disabled in that configuration.

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