Gen 4 Value Chassis

Gen4 4U Value 5-Slot Expansion System

This 5 slot rackmount expansion platform provides GPU expansion at a value price. 

SKU: OSS-PCIe4-4UV-5-1-xM
Weight: 60 lb

The 4UV supports 1 PCIe 4.0 x16 host connection to 5 PCIe 4.0 x16 slots with one 1m cable to the host server. The system supports 4 double width GPUs or 5 single slot GPUs or add-in boards. Two fan choices allow for high-power GPU cooling up to 300W per GPU or a set-and-forget manual speed control using PWM fans when lower power GPUs or add-in cards are used. Two 2000W power supplies provide up to 4000W of usable power to the GPU accelerator system. 


  • 4U rackmount design
  • 5 PCIe 4.0 x16 expansion slots
  • One PCIe 4.0 x16 host connection
  • Includes 1m cable
  • Tach and PWM fan options
  • Two 2000W load-sharing power supplies
  • Eight EPS12V PCIe power connectors

19”W x 18.5”D x 7”H (4U)
Supports up to 5 usable full-height, full-length PCIe slots plus 1 cable interface in 5-1 configuration
Supports extended height cards and top GPU power cables
Black medium texture liquid paint finish with optional OEM logo area
Power and Fan status tri-color LED panel
Tool less rack slides included

PCIe Backplanes

One OSS-PCIe-BP-522 PCIe4 5-slot expansion backplanes.
The 5-slot integrated system includes:

  • One PCIe 4.0 x16 cable target interface
  • Three PCIe4 x16 double-width slots
  • Two PCIe4 x16 single-width slots
Host/Target Interface

The system includes one PCIe 4.0 x16 host/target interface for connecting the accelerator to just about any server.
Host/Target Interface:

  • Half-height, half length, single slot x16 PCIe add-in card form factor
  • PCIe4 x16 physical card edge connector (256 Gbps)
  • Quad SSF-8644 cable connectors on the bracket
  • Broadcom PEX88032 switch includes:
    • Fast-cut through, 150ns latency
    • Non-blocking switch fabric
    • 16 GT/s 32-lane PCI Express Gen 4 Switch
    • SSC isolation
    • DMA controller
  • 60W typical

Each host/target interface comes with a Passive x16 1m cable


Three 120mm x 38mm fans mounted to the front bezel of the chassis

  • 250CFM fixed-speed fans
  • Tachometer monitoring via front panel LED
  • Perfect for GPU or FPGA accelerator applications up to 3000W

Dual load-sharing power supplies pluggable from the rear of the chassis:

  • Two 2000W 80Plus Titanium efficiency power supplies with dual IEC C14 AC input connectors
  • Total output power:
    • 1000W: 100-127Vac / 12.5-9.5A / 50-60 Hz
    • 1800W: 200-220Vac / 10-9.5A / 50-60 Hz
    • 1980W: 220-230Vac / 10-9.8A / 50-60 Hz
    • 2000W: 230-240Vac / 10-9.8A / 50-60 Hz
  • Power supplies can provide up to 4000W non-redundant total power to the system
  • Supplies are redundant, hot-swap when system power requirements are under 2000W total

Aux Power:
An array of 8 EPS12V AUX power connectors available for high-power cards

Operating Environment 0-35°C 10-90% relative humidity 0-10,000 feet above sea level
Storage Environment -40 to 85°C 5-96% relative humidity 0-50,000 feet above sea level
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: or 877-438-2724

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