STARTECH PEXUSB3S25 2 Port PCI Express USB 3.0 Expansion Card
- 2x USB Ports
- USB 3.0
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Adds two 32-bit PCI slots at 33 MHz and two PCI Express x1 slots via a single host connection
The StarTech PEX2PCIE4L is a riser card that adds four expansion slots through a single PCI Express host interface. It provides two 32-bit PCI slots running at 33 MHz and two PCI Express x1 slots in a full-height form factor. This card suits technicians who need to install legacy PCI cards alongside modern PCIe devices in one system. Builders requiring more than four additional slots should look elsewhere.
The card connects through a standard PCI Express host link, so total throughput is shared across all four slots. Each 32-bit PCI slot operates at 33 MHz, while each PCIe x1 slot uses a single lane. Bandwidth-intensive cards may not reach full speed when multiple slots are active simultaneously. Users needing dedicated bandwidth per slot cannot achieve it with this shared topology.
The deciding specification is the total of four expansion slots: two PCI and two PCI Express x1. This fixed count determines whether the card matches the number of add-in boards you plan to install. If your build requires a different mix or a higher slot count, this riser will not fit the requirement.
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| Product | |
|---|---|
| Brand name | StarTech.com |
| Model name | PEX2PCIE4L |
| Product type | Riser Card |
| Size & build | |
| Shipping weight | 4.54 kg |
| Package size | 457 × 406 × 356 mm |
Match each card to its native slot type: legacy PCI cards go in the two 32-bit/33 MHz full-height slots, while modern single-lane PCIe cards use the two PCIe x1 slots.
The host PCIe link carries all traffic for the four downstream slots, so total bandwidth is shared across any active cards in both the PCI and PCIe x1 connectors.
Yes, the PCI slots operate at 32-bit/33 MHz while the host link is a single PCIe lane, so neither slot type can exceed that lane's bandwidth.
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