QNAP QXP-3X4PES PCIe Gen3 x4 SFF-8644 Expansion Card

Overview

The QXP-3X4PES is a low-profile PCIe Gen3 x4 expansion card that adds two SFF-8644 external Mini-SAS HD ports to a compatible QNAP NAS or server. It delivers up to 32Gbps aggregate throughput — enough bandwidth to feed multiple storage expansion enclosures simultaneously without saturating the host bus. The QXP-3X4PES fits the narrow-chassis install scenario: its low-profile bracket slides into a half-height PCIe slot, making it the right pick for rackmount NAS units where a full-height card physically won't seat. If you're connecting a QNAP JBOD expansion unit or a direct-attach storage shelf to a NAS that ships with no external SAS connectivity, this card is the bridge.

Compatibility

Designed to pair with QNAP JBOD and expansion enclosures such as the QNAP JBOD series and compatible expansion chassis that use SFF-8644 (external Mini-SAS HD) connectors. The host NAS or server must have an available PCIe Gen3 x4 (or wider) slot — the card runs at x4 electrical, so installing it into a physical x8 or x16 slot is mechanically valid, but an x1 or x2 slot will not provide sufficient bandwidth and is not a supported configuration. Verify your specific QNAP NAS model's PCIe slot availability and supported expansion card list on QNAP's compatibility page before ordering, as not every chassis exposes a usable PCIe slot to end users.

Installation Notes

The card ships with a low-profile bracket pre-installed — confirm your chassis accepts low-profile add-in cards before ordering. If the host system requires a full-height bracket, check whether one is included or needs to be sourced separately, as the evidence does not confirm a dual-bracket bundle. SFF-8644 cables are not included; you will need appropriately rated external Mini-SAS HD cables matched to the length and bend-radius requirements of your enclosure layout. Seat the card fully into the PCIe slot and secure the bracket screw before connecting cables to avoid mechanical stress on the port housing.