ExpressBox 4400

The EB4400 provides PCIe Gen 4 configurable expansion for ruggedized, transportable AI applications at twice the performance of the previous generation PCIe Gen 3.

Please call for pricing.

Weight: 25 lb

The appliance supports up to 4 NVIDIA A100 PCIe GPUs which deliver 2.5x FP64 performance compared to the NVIDIA V100, with two PCIe Gen 4 x16 HBA/NIC slots for up to 128GB/s of sustained data throughput. Alternatively, the EB4400 can be configured to provide 8 single-width PCIe Gen 4 x8 slots for FPGA data ingest or the latest storage add-in cards. Additional features including dynamic fan speed control, IPMI based system monitoring, replaceable fan filters, and optional SmartNIC host configuration elevate the EB4400 to the ideal expansion platform for the entire AI workflow. The EB4400 combines a small, rugged form factor with the latest PCIe Gen 4 add-in cards and features to meet the needs of any airborne, naval, or ground based transportable AI application.


  • PCIe Gen 4 architecture
  • Small, rugged frame design
  • Dynamic fan speed control
  • Configurable slot and host uplinks to optimize throughput
  • Integrated IPMI based system monitoring
  • AC and DC power inlet options

Application Examples:

  • EB4400 as a GPU Compute Accelerator
    • OSS-538, 5-slot PCIe Gen4 x16, supporting 4 dual-width GPU
    • 2x PCIe4 x16 Host-to-Target uplinks (128 GB/s)
  • EB4400 as a Flash Storage Array
    • OSS-521, 8-slot PCIe Gen4
    • 8x OSS-PCIe4-ADPT-x8-M.2-2 for 16x hot-swappable PCIe Gen4 M.2/E1.S drives
    • PCIe4 x16 Host-to-Target uplinks (32 GB/s)
  • EB4400 as an FPGA Sensor Array
    • OSS-521, 8-slot PCIe Gen4, supporting 7 PCIe Gen4 x8 FPGA sensor add-in cards
    • 2x PCIe4 x16 Host-to-Target uplinks (64 GB/s)

4U Custom Form Factor (10.7” x 7.0” x 18.5”)
Net weight 25 lbs.

Host Options

1x PCIe4 x16 Host-to-Target uplink (32 GB/s)
2x PCIe4 x16 Host-to-Target uplinks (64 GB/s)
SmartNIC Host

Backplane Options


  • 1x single-width PCIe 4.0 x16 FHFL upstream slot
  • 4x dual-width PCIe 4.0 x16 FHFL downstream slots


  • 1x single-width PCIe 4.0 x16 FHFL upstream slot
  • 6x single-width PCIe 4.0 x16 FHFL downstream slots
  • 1x dual-width PCIe 4.0 x16 FHFL downstream slot
Additional Slot Options


  • Modifies one dual-width PCIe 4.0 x16 FHFL downstream slot to two single-width PCIe 4.0 x16 FHFLdownstream slots per backplane


  • Adds an additional single-width PCIe 4.0 FHFL downstream slot per backplane
Environmental Specifications


  • Operating temp 0 ° to 35 °C ambient.
  • Short-term (30 mins) operating temp –5°C to 40°C ambient.
  • Storage temp –40°C to 70°C.

Operational humidity

  • Operating humidity 5-95% (non-condensing)
  • Storage humidity 0-95% (non-condensing)

Operational altitude:

  • Operating altitude 6000 ft. at operating temp, 15,000ft. at derated temp.
  • Storage altitude 40,000 ft.


  • 2x 180CFM 92mm fans
  • Default PWM controlled based on built-in temperature sensors
  • Optional IPMI system monitoring and control
Power Options

Single/Dual AC 1600W
Single/Dual DC 1600W

System Monitoring

Default – automatic dynamic temperature-based fan speed control
Optional – IPMI system monitoring with power, temperature, and fan speed control and monitoring

Fan Filters

Optional Quadrafoam 45 PPI Replaceable Fan Filters

PCIe 4.0 Cable Lengths


Power Cords

6’ US 110V
6’ US 240V
6’ UK
2’ IEC
6’ IEC

Agency Compliance

Agency Certifications (testing pending):
FCC Class A
CE Safety & Emissions


Warranty Information:

One Stop Systems warrants this product to be free of defects in material and workmanship for the warranty period purchased by the customer (1 to 5 years) from OSS beginning on the date of delivery to the original purchaser from OSS . During this period, One Stop Systems will, at its option, repair or replace this product at no additional charge to the purchaser, except as set forth in this warranty agreement. OSS will, at its option, repair or replace this product at no additional charge to the purchaser, if the defect is related to the OSS manufactured product. OSS is not liable for any defects in material or workmanship of any peripherals, products or parts, which OSS does not design or manufacture (third party products). OSS will honor the original manufacturer’s warranty on these products. One Stop Systems will analyze the defective component and the customer will be charged only in the following instances:

  • No problem found: $125(U.S dollars)
  • Damage Due to Negligence or Mishandling: Parts and labor at $75 per hour with a $100 minimum charge (U.S. dollars). Receipt of damaged goods voids the One Stop Systems warranty.

Repair parts and replacement products will be furnished on an exchange basis and will be either new or reconditioned. All replacement parts and products shall become the property of OSS, if such parts or products are provided under this warranty agreement. In the event a defect is not related to the OSS manufactured product or is not covered by the third party product, OSS shall repair or replace the defective parts at the purchaser’s cost and deliver the defective parts to the purchaser. This limited warranty shall not apply if the product has been misused, carelessly handled, defaced, modified or altered, or if unauthorized repairs have been attempted by others. The above warranty is the only warranty authorized by OSS and is in lieu of any implied warranties, including implied warranty of merchantability and fitness for a particular purpose. In no event will One Stop Systems be liable for any such damage as lost business, lost profits, lost savings, downtime or delay, labor, repair or material cost, injury to person or property or any similar or dissimilar consequential loss or damage incurred by the purchaser, even if OSS has been advised of the possibility of such losses or damages.

Depending on the warranty service level purchased, warranty service is obtained by advanced replacement when accompanied by a signed Warranty Service Agreement form or by delivering the product to an OSS authorized repair facility with all parts and accessories as originally shipped, along with the proof of purchase and a Returned Merchandise Authorization (RMA) number. The RMA number is obtained in advance from OSS Support or Customer Service Department and is valid for 30 days. The RMA number must be clearly marked on the exterior of the original shipping container or equivalent. Purchaser will be responsible and liable for any missing or damaged parts. Purchaser agrees to pay for shipping charges one way, and to either insure the product or assume the liability for loss or damage during transit.

Ship to: One Stop Systems



2235 Enterprise Street, Suite 110

Escondido, CA 92029

Support: support@onestopsystems.com or 877-438-2724

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