STARTECH PEXUSB3S25 2 Port PCI Express USB 3.0 Expansion Card
- 2x USB Ports
- USB 3.0
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Shenzhen Lianrui Information Technology
Connects eight NVMe SSDs through a PCIe 3.0 x16 slot using PLX 8749 switching with 126 ns latency
The LRNV9349-8I is a PCI Express x16 Gen 3 multi-host switch card built around the PLX 8749 chipset. It provides eight internal SFF-8643 connectors for attaching up to eight NVMe SSDs or PCIe adapter cards. The card delivers a data transfer rate of 6.0 Gbps and weighs 0.33 lb.
This card targets servers, storage arrays, communications gear and graphics platforms that need scalable, non-blocking interconnects between multiple hosts and endpoints. It is not intended for builders who only need a single NVMe drive on a desktop motherboard, nor for systems lacking a full x16 Gen 3 slot.
The adapter consumes a single PCIe 3.0 x16 lane and breaks it out to eight SFF-8643 ports, freeing additional expansion slots that would otherwise be needed for individual controllers. Its cut-through switching achieves 126 ns maximum latency with 2048-byte packet payloads, enabling full line-rate performance across all connected endpoints.
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| Product | |
|---|---|
| Brand name | Linkreal |
| Product line | PCI Express x16 to 8 U.2 SFF-8643 NVMe SSD Adapter Card |
| Model name | LRNV9349-8I |
| Product type | Controller Card |
| Performance | |
| Transfer speed | 6.0 Gbit/s |
| Connectivity | |
| Supported standards | PCI Express x16 to 8 U.2 SFF-8643 NVMe SSD Adapter Card |
| Ports & slots | |
| Internal ports | 8 Port SFF-8643 |
| Size & build | |
| Product weight | 0.33 lb (0.15 kg) |
The card needs a physical PCIe x16 slot wired for Gen 3.0 to deliver its full host-bus bandwidth.
Yes — the PLX 8749 switch negotiates per-port speed, so each NVMe SSD will run at the highest rate its own link supports.
Run a PCIe latency test tool that measures round-trip time across the switch; a result near 126 ns confirms the PLX 8749 is operating in cut-through mode.
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