We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver 4U rackmount server chassis, front drive bays and ventilation grille visible

Supermicro

Supermicro SYS-421GU-TNXR 4U barebone server

SKU CH-7W2B-CGMGM MPN SYS-421GU-TNXR

4U rackmount barebone for AI and HPC workloads, supporting dual Xeon CPUs, 32 DDR5 DIMM slots up to 8 TB, and four double-width GPUs with NVLink

  • Form Factor4U Rackmount
  • WorkloadAI/ML/HPC
  • CPU TypeIntel Xeon
  • CPU SocketLGA 4677
  • Installed CPUNo CPU Installed
  • Max Processors2
  • 32 DDR5 slots support up to 8 TB for large datasets
  • Dual Xeon sockets accept up to 350 W TDP for heavy compute
  • Four double-width GPUs with NVLink accelerate AI training
  • Eight PCIe 5.0 x16 slots enable high-bandwidth expansion
  • 10 GbE LAN and M.2 boot drives simplify deployment

4U AI barebone for dual Xeon

The Supermicro SYS-421GU-TNXR is a 4U rackmount barebone designed for AI, machine learning and high-performance compute workloads. It accepts up to two 4th Generation Intel Xeon Scalable processors with future support for 5th Generation parts. Each socket handles up to 350 W TDP using air or liquid cooling. The Intel C741 chipset provides the platform foundation.

Verify CPU cooler clearance and power budget

Before ordering, confirm that your chosen LGA 4677 processors do not exceed the 350 W TDP limit per socket. Ensure the cooling solution you select fits the 4U form factor and matches the air or liquid specification. The system ships with no CPU or memory installed, so you must source compatible DDR5 4800 ECC modules and processors separately. Network connectivity relies on the integrated Intel X710-AT2 dual-port 10 Gigabit controller.

Four double-width GPU slots with NVLink

The chassis supports up to four double-width GPUs including NVIDIA HGX H100 80 GB SXM modules linked by NVLink. CPU-to-GPU communication runs over PCIe 5.0 x16. Eight PCIe 5.0 x16 slots provide additional expansion. Storage options include six 2.5-inch hot-swap bays for NVMe, SATA or SAS drives and two M.2 slots configurable for NVMe or SATA boot devices. No drives are included.

Highlights

  • 32 DDR5 slots support up to 8 TB for large datasets
  • Dual Xeon sockets accept up to 350 W TDP for heavy compute
  • Four double-width GPUs with NVLink accelerate AI training
  • Eight PCIe 5.0 x16 slots enable high-bandwidth expansion
  • 10 GbE LAN and M.2 boot drives simplify deployment

Specifications

BrandSUPERMICRO
ModelSYS-421GU-TNXR
Form Factor4U Rackmount
WorkloadAI/ML/HPC
CPU TypeIntel Xeon
CPU SocketLGA 4677
Installed CPUNo CPU Installed
Max Processors2
CPU Features4th Gen Intel Xeon Scalable processors
Future support for the upcoming 5th Gen Intel Xeon processors
Supports up to 350W TDP CPUs (Air Cooled)
Supports up to 350W TDP CPUs (Liquid Cooled)
North BridgeIntel C741
Memory Slots32 x 288Pin
Installed Memory SizeNo Memory Installed
Max Memory SupportedUp to 8TB: 32 x 256 GB DRAM
Memory Type SupportedDDR5 4800
ECC SupportedYes
Installed HDDNo Storage Installed
M.22 x M.2 NVMe OR 2 x M.2 SATA3
GPU/VPUMax GPU Count: Up to 4 double-width GPU(s)
Supported GPU: NVIDIA SXM: HGX H100 4-GPU (80GB)
CPU-GPU Interconnect: PCIe 5.0 x16 CPU-to-GPU Interconnect
GPU-GPU Interconnect: NVIDIA NVLink
PCI Express1 x PCIe 5.0 x16 LP slot(s)
7 x PCIe 5.0 X16 slot(s)
First LANIntel X710-AT2
Max. LAN Speed10 Gigabit
Hot-Swap Bays6 x 2.5" hot-swap NVMe/SATA drive bays (6 x 2.5" NVMe hybrid)
VGA1
RJ452
Max. Power4x 3000W Redundant Titanium Level power supplies
TemperatureOperating Temperature: 10°C ~ 35°C (50°F ~ 95°F)
Non-operating Temperature: -40°C to 60°C (-40°F to 140°F)
HumidityOperating Relative Humidity: 8% to 90% (non-condensing)
Non-operating Relative Humidity: 5% to 95% (non-condensing)
FeaturesCryptographically Signed Firmware
Secure Boot
Secure Firmware Updates
Automatic Firmware Recovery
Supply Chain Security: Remote Attestation
Runtime BMC Protections
System Lockdown
Dimensions7" x 17.67" x 32.79"
Weight105 lbs.
Shipping weight63.50 kg
Package size1260 × 700 × 370 mm

Questions about this item

Does the SYS-421GU-TNXR include any CPUs, memory modules or drives, or must I source them separately?

The barebone arrives with no CPU installed, no memory installed and no storage installed; you must add up to two LGA 4677 Xeon processors, DDR5 4800 ECC DIMMs and your choice of 2.5" NVMe, SATA or SAS drives plus M.2 boot devices.

Which DDR5 4800 capacity should I choose to reach the 8 TB maximum across the 32 slots?

Populate all 32 slots with 256 GB ECC DDR5 4800 modules to hit the 8 TB ceiling; smaller capacities work but will leave total memory below the maximum.

What does the PCIe 5.0 x16 CPU-to-GPU interconnect mean for an HGX H100 4-GPU (80 GB) configuration?

Each of the four double-width GPUs connects to the CPUs through a dedicated PCIe 5.0 x16 link, while the GPUs talk to each other over NVIDIA NVLink for high-bandwidth peer transfers.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.