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The Supermicro SYS-112D-40C-FN8P combines a 40-core Intel Xeon 6 SoC, eight 25GbE SFP28 ports, and two PCIe 5.0 x16 expansion slots in a short-depth 1U chassis. It is built for network-heavy edge deployments—not as a general-purpose tower or a server with front-access drive bays. Its specifications make it compelling for telco and edge designs, but ServeTheHome’s networking test was preliminary and did not validate the system’s vRAN acceleration path.
What the SYS-112D-40C-FN8P is
This is a 1U rackmount edge server built around Supermicro’s X14SDW-40C-SP9F board and CSE-515M2-R000NP chassis. The datasheet gives dimensions of 437 × 43 × 399 mm (15.7 inches deep). That depth may help in constrained racks, but fit depends on the rack’s usable depth, rails, cabling, and service clearances. In his April 16, 2026 review, Patrick Kennedy of ServeTheHome called it short enough for “the majority of racks out there”; that is his observation, not a universal fit guarantee.
The layout emphasizes front-side access: the review notes front I/O and front-mounted power supplies, which can be useful where the rear of a rack is difficult to reach. Supermicro identifies MEC, telco edge, 5G DU, satellite communications, vRAN/ORAN, and edge AI as intended applications. Those are target use cases, not proof of performance with any particular application or software stack.
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Core specifications
| Component | SYS-112D-40C-FN8P specification |
|---|---|
| Processor | Intel Xeon 6716P-B SoC; 40 cores, 80 threads, 160 MB cache; 2.50 GHz listed in the platform manual; maximum CPU TDP 235 W |
| Memory | Up to 512 GB DDR5-6400 ECC RDIMM, four DIMM slots, one DIMM per channel |
| Network | Eight SFP28 25GbE ports via the Intel SoC, plus one Intel I210-IT RJ45 1GbE LAN port |
| Storage | Two internal fixed 2.5-inch NVMe bays and one M.2 PCIe 4.0 x2 NVMe M-key 2280 slot |
| Expansion | Two PCIe 5.0 x16 FHHL slots; GPU width support requires configuration-specific confirmation |
| Power | Two redundant 800 W Platinum power supplies |
| Operating environment | 0°C to 40°C; 8% to 90% relative humidity, non-condensing |
Specifications are from Supermicro’s datasheet and platform manual; the manufacturer warns that specifications can change without notice. Check the current revision and exact configuration when ordering.
#1 Best Overall
- Key Features Intel Xeon Processor D-1718T, CPU TDP 46W Up to 256GB Registered ECC RDIMM, DDR4-2933MT/s, in 4 DIMM slots 4 GbE and Dual 25G SFP28 1 Internal 3.5" or 4 Internal 2.5" drive bays 3x 40x28mm 4-PIN PWM fans 200W Low-noise AC-DC power supply 1x VGA, 2 USB 3.0
CPU, memory, and compute fit
40-core Xeon 6 SoC
The Xeon 6716P-B is listed with 40 cores and 80 threads. That makes the system’s compute density clear, but core count alone does not establish how it will perform on a given workload. The available review material does not provide a basis for treating the system as broadly benchmarked across virtualization, packet processing, or application workloads.
Memory ceiling and layout
Memory capacity tops out at 512 GB of DDR5-6400 ECC RDIMM across four slots, in a one-DIMM-per-channel arrangement. Buyers should verify that their target capacity and memory modules fit Supermicro’s supported configuration for the exact system revision.
Eight 25GbE ports are the defining feature
All eight SFP28 25GbE ports are driven by the Intel SoC. The separate RJ45 connection is a 1GbE LAN port using an Intel I210-IT controller. This combination is suited to designs that need several high-speed network links in a compact chassis, while preserving a conventional copper management or service connection.
Rank #2
- Intel Xeon D-2146NT 8-Core Processor, Configured with ECC RDIMM Memory and NVMe M.2 Drive
- Supports up to 512GB DDR4 ECC LRDIMM, Supports 4 x 2.5" SATA Drive Bays or 2x U.2 drives
- PCI-E 3.0 x8 Low Profile Slot, 1 x M.2 2242 slot (PCI-E 3.0 x2, SATA, B Key)
- Quad GbE LAN, 2 x 10GBase-T, 2 x 10G SFP+, and IPMI
- Compact 1.5U Form Factor: 10" x 2.6" x 8.9"
ServeTheHome describes an iperf3 run using four 25GbE flows and simple DAC connectivity, but characterizes its approach as “quick and dirty” and says further NIC validation was still needed. It should be read as an initial check, not a complete performance qualification or a guarantee of throughput under production traffic patterns. DAC cable compatibility depends on the connected switch and deployment; no particular cable was established as tested.
Storage and expansion: check the physical configuration
Internal NVMe, not front-access drive bays
The datasheet lists two internal fixed 2.5-inch NVMe bays and one M.2 PCIe 4.0 x2 M-key 2280 NVMe slot. ServeTheHome’s walkthrough says it found no externally accessible storage. These descriptions are compatible: the system has internal storage locations, but not externally accessible front drive bays. Supermicro lists NVMe RAID 0, 1, 5, and 10 support when an Intel VROC RAID key is installed.
A separate M.2 E-key timing module is not another SSD connection. Do not count it as additional NVMe storage when planning capacity.
Two PCIe 5.0 x16 slots and GPU ambiguity
The system provides two PCIe 5.0 x16 FHHL slots. Supermicro’s datasheet specifies support for up to one single-width GPU, while ServeTheHome describes room for a double-width accelerator card. Because those statements differ, double-width support should not be assumed: confirm the exact SKU, riser, card dimensions, power and cooling requirements, and system configuration with Supermicro before selecting an accelerator.
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Timing, I/O, and installation details
Alongside the network ports, the system includes three SMA connections for GNSS, 1PPS input, and 1PPS output, plus four dry-contact sets. These interfaces make timing and external signaling part of the platform’s design. The front panel also has a Mini DisplayPort and two USB 3.2 Gen 1 Type-A ports.
The platform manual warns not to exceed 0.5 N·m when tightening antennas or SMA cables; excessive torque can damage the connectors. Treat this as an installation constraint, not a general recommendation for other SMA equipment.
Rank #4
What the review does—and does not—establish
The review is useful for understanding the physical layout, front-access orientation, port arrangement, and the initial network test. It is not a full validation of the server’s advertised edge use cases. Kennedy says access to much of the vRAN software stack is controlled by Intel, preventing the review from benchmarking that acceleration path.
The review’s benchmark page labels its AgentSTH V5 results as a preview and describes its workload methodology. Those results should not be presented as a final standardized benchmark, nor used to claim that this server has been comprehensively tested for every target workload.
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Quick Recap
Who should consider it
- Consider it if a deployment needs a short-depth 1U platform with eight 25GbE SFP28 ports, Xeon 6 compute, timing interfaces, and PCIe expansion.
- Check carefully if you require front-serviceable drive bays, more than 512 GB of memory, a specific accelerator geometry, or validated performance on a particular vRAN or edge-AI stack.
- Confirm before installation the rack’s depth and clearance, exact riser and accelerator configuration, supported memory and storage parts, and current manufacturer specifications.
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