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Green rectangular EEB server motherboard with dual LGA 4189 sockets, sixteen DDR4 slots, five full-length PCIe x16 slots

ASRock Rack

ASRock Rack SP2C621D16-2T EEB server motherboard dual LGA 4189 8+8 DDR4 3200

SKU CH-29W0-K2X4F MPN SP2C621D16-2T

EEB dual-socket server motherboard with 16 DDR4 3200 DIMM slots, five PCIe 4.0 x16 slots, 14 SATA ports and dual 10 GbE LAN

  • CPU Socket TypeLGA 4189
  • CPU TypeSupports 3rd Gen Intel Xeon Scalable processors
  • Number of Processor Support2
  • North BridgeIntel C621A
  • Number of DDR4 Slots8+8 DIMM slots (1DPC)
  • DDR4 StandardDDR4 3200
  • Dual LGA 4189 sockets enable two 3rd Gen Xeon processors
  • 8+8 DDR4 3200 DIMM slots for high-capacity memory
  • Five PCIe 4.0 x16 slots plus one x8 for expansion
  • Fourteen SATA 6.0Gb/s ports with RAID 0/1/5/10
  • Dual 10GbE LAN via Intel X550-AT2

Dual LGA 4189 server board for 3rd Gen Xeon

The ASRock Rack SP2C621D16-2T is an EEB form-factor motherboard built around the Intel C621A chipset. It accepts two 3rd Gen Intel Xeon Scalable processors in LGA 4189 sockets and provides sixteen DDR4 3200 DIMM slots in a 1DPC layout. Five PCIe 4.0 x16 slots and one x8 slot deliver high-bandwidth expansion for compute accelerators or networking cards. Dual 10 GbE ports driven by an Intel X550-AT2 controller handle heavy data traffic.

Suited for dense virtualization and storage nodes

This board targets builders who need dual-socket performance with abundant memory capacity and fast networking. The fourteen SATA 6.0 Gb/s ports and two SlimSAS connectors support large drive arrays without add-in HBAs. Buyers who require more than one M.2 device or who need integrated Wi-Fi should look at alternative platforms. Systems that must fit in standard ATX chassis cannot use the 12 x 13 inch EEB outline.

Sixteen DDR4 3200 slots in 1DPC configuration

Memory capacity tops out at sixteen modules running at 3200 MT/s, with each channel populated by a single DIMM for signal integrity. RDIMM, LRDIMM and Intel Optane persistent memory are all supported. This density decides whether the platform can hold the working set for in-memory databases or large VM fleets.

Highlights

  • Dual LGA 4189 sockets enable two 3rd Gen Xeon processors
  • 8+8 DDR4 3200 DIMM slots for high-capacity memory
  • Five PCIe 4.0 x16 slots plus one x8 for expansion
  • Fourteen SATA 6.0Gb/s ports with RAID 0/1/5/10
  • Dual 10GbE LAN via Intel X550-AT2

Specifications

BrandAsRock Rack
ModelSP2C621D16-2T
CPU Socket TypeLGA 4189
CPU TypeSupports 3rd Gen Intel Xeon Scalable processors
Number of Processor Support2
North BridgeIntel C621A
Number of DDR4 Slots8+8 DIMM slots (1DPC)
DDR4 StandardDDR4 3200
PCI Express 4.0 x16SLOT6: PCIe4.0 x16 [CPU1]
SLOT5: PCIe4.0 x16 [CPU1]
SLOT4: PCIe4.0 x16 [CPU1]
SLOT3: PCIe4.0 x16 [CPU0]
SLOT2: PCIe4.0 x16 [CPU0]
PCI Express x8SLOT1: PCIe4.0 x8 [CPU0]
SATA14 x SATA 6.0Gb/s
SATA RAID0/1/5/10
SAS2 SlimSAS (PCIe4.0x8) [CPU0]
M.21 M-key (PCIe4.0 x4); Support 22110/2280 form factor [CPU0]
Onboard Video ChipsetAspeed AST2500
LAN ChipsetIntel X550-AT2
LAN Speed10Gbps
Max LAN Speed10Gbps
Back I/O Ports1 x D-Sub / 2 x LAN (RJ45) / 2 x USB 3.2 Gen 1 Type-A
Other ConnectorsInternal Connector/Headers
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
Video output: 1
Fan Header: 4 (8-pin), 2 (6-pin)
TPM Header: 1 (13-pin, SPI)
VROC header: 1
HSBP: 1
SMBus header: 1
PMB header: 1
Clear CMOS: 1 (contact pads)
USB 3.2 (Gen1) Header: 1 (19-pin, 2 USB3.2 Gen1)
Power Connector: 1 (24-pin, ATX main power), 3 ( 8-pin, ATX 12V)
Form FactorEEB
Dimensions (W x L)12" x 13"
Shipping weight3.00 kg
Package size382 × 360 × 67 mm

Questions about this item

Should I populate all 16 DDR4 3200 slots or start with fewer modules?

The board has 8+8 DIMM slots running 1DPC, so each slot connects directly to a memory controller. Filling all 16 slots gives maximum capacity and bandwidth, but you can start with a smaller matched set per CPU and add later.

What does the dual LGA 4189 layout mean for actual throughput?

Two sockets each drive their own PCIe 4.0 lanes — five x16 slots and one x8 slot split between the CPUs — so GPU, storage or networking cards can run at full Gen 4 speed without sharing bandwidth across sockets.

How fast are the onboard 10GbE ports in practice?

The Intel X550-AT2 controller provides two RJ45 ports at 10 Gbps line rate, so sustained throughput approaches 10 Gbps per port with compatible cabling and switch partners.

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