521 Backplane

Expansion Backplane, 8 PCIe x8 slots (521)

Backplane with eight PCIe x8 Gen4 slots and one PCIe x16 target slot. Requires an OSS target adapter card to be installed in the target slot. Cable and adapter sold separately.

Weight: 2 lb

The OSS target backplane supports a PCIe Gen4 target cable adapter installed in the OSS target slot and up to eight PCIe x8 expansion cards installed in the expansion slots. Slots are backward compatible and support Gen1, Gen2, and Gen3 cards. OSS target backplanes only support OSS target adapters installed the target slot of the backplane. OSS PCIe backplanes support expansion cards designed to the PCIe PCI-SIG specification. This backplane operates with ATX power.



(H x L)

7.175" x 8.820"
Power ATX

1 PCIe 4.0 x16 OSS target slots (for OSS target cable adapter only)

8 PCIe 4.0 x8 slots for end point devices

PCIe Switch

Broadcom PLX PEX 88096

  • 16GT/s 96-lane PCI Express Gen 4 Switch
  • DMA controller
  • SSC isolation
Switch Latency 15ons
Operating Temperature 0C to 50C

Storage Temperature

-40C to 85C
Operating Temperature 10% to 90% relative humidity non-condensing
Storage Temperature -40C to 85C

Operating Humidity

10% to 90% relative humidity non-condensing
Storage Humidity 5% to 90% relative humidity non-condensing
Agency Compliance

Designed to meet the following agency standards:

  • FCC - Part 15 Class A, 47CFR; Canada ICES-003, issue 4, Class A; Japan: VCCI, Class A; CE Emissions 2004-108EC
  • UL/IEC 60950-1; Canada: CSA C22.2 No.60950-1; Argentina: IEC60950-1 (CB Certificate and CB Test Report)
  • CE Mark (EN55022 Class A, EN60950-1; EN55024, EN61000-3-3)
  • CISPR 22, CISPR 24, Class A; Australia/New Zealand AS/NZS CISPR 22, Class A RoHS 6 of 6 compliance (Directive 2002/95/EC)


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