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Green circuit board with silver SAS connectors and full-height bracket

Qnap

Qnap QXP820SB3408 12Gb/s SAS expansion card

SKU CH-HEYM-TKJEX MPN QXP820SB3408

Adds 12 Gb/s SAS connectivity to a QNAP NAS, enabling daisy-chained expansion up to 4.6 PB with TL and REXP enclosures

  • Expand NAS capacity up to 4.6PB by daisy-chaining 16 SAS JBOD enclosures
  • Four 12Gb/s SAS channels per port deliver 48Gb/s host bandwidth
  • Low-latency SAS drives boost IOPS over SATA for virtualization workloads
  • Flexible port configuration enables faster backup and continuous service
  • PCIe add-on card designed for QNAP NAS and REXP expansion units

High-Bandwidth SAS Expansion Card

The Qnap QXP820SB3408 is a 12Gb/s SAS HBA PCIe expansion card built for QNAP NAS owners who need to attach TL SAS JBOD enclosures or REXP expansion units. It targets businesses running virtualization, surveillance, Big Data, video editing or TV broadcast workloads that demand low-latency, IOPS-optimised storage beyond what SATA can deliver.

Daisy-Chain Ready Host Adapter

Each of the card’s SAS ports aggregates four 12Gb/s channels for up to 48Gb/s per host connection, and the adapter supports daisy-chaining up to 16 devices to reach a total raw capacity of 4.6PB when populated with 18TB drives in sixteen 16-bay enclosures. The card plugs into a compatible PCIe slot on the NAS and uses mini SAS HD cables, freeing internal drive bays for other tasks while moving bulk storage to external chassis.

Upgrade from SATA or Single-Enclosure SAS

This card replaces a SATA-only connection or a single-enclosure SAS link when the workload outgrows internal bays or requires the dual-port redundancy and higher throughput of 12Gb/s SAS. The jump is worth it when the environment needs multiple expansion units, consistent low latency under heavy random I/O, or the simplified cable management that daisy-chaining provides. It is not for systems without a QNAP NAS or for direct attachment of non-SAS drives.

How it compares

Measured against everything we stock in PCIe Expansion Cards, at today’s prices. Recalculated every night.

Price $293.99
Pricier than about 90% of the 891 comparable items (median $30.99).

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Specifications

Size & build
Shipping weight0.45 kg
Package size203 × 152 × 51 mm

Questions about this item

What maximum throughput does the 12Gb/s SAS host connection reach?

Each SAS port combines four 12Gb/s channels, delivering up to 48Gb/s per host connection.

How much heat and noise does the card add when running continuously in a NAS?

The card is a passive add-on without its own fan, so it adds negligible noise and relies on the NAS chassis airflow for cooling.

Which QNAP enclosures must I already own to use this expansion card?

It connects a compatible QNAP NAS to TL SAS JBOD storage enclosures or REXP expansion units via mini SAS HD cables.

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