STARTECH PEXUSB3S25 2 Port PCI Express USB 3.0 Expansion Card
- 2x USB Ports
- USB 3.0
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Splits one PCIe x1 slot into four PCIe USB 3.0 ports for multi-GPU mining rigs
This Wadermoon adapter converts a single PCIe x1 slot into four PCIe USB 3.0 ports, letting miners attach multiple graphics cards to one motherboard. The card works with DOS, Linux, Windows XP, 7, 8 and 10, and includes an aluminium heatsink for thermal management. It draws power directly from the slot, so no extra cable is required.
Instead of using one riser per GPU, this multiplier lets a single x1 lane feed four cards, saving motherboard slots and chassis space. The upgrade is worthwhile when the board cannot accept more physical x16 cards but the OS and driver stack can still enumerate additional GPUs. Windows 10 recognises up to eight cards, while Windows 7 stops at six.
The board screws into a standard case bracket and needs no auxiliary power, making installation straightforward. Common issues include the USB-style ports carrying only PCIe signals, so they cannot connect ordinary USB devices. Motherboard BIOS limits and Windows GPU caps often require a modified driver or a Linux-based mining OS for full utilisation.
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| Product | |
|---|---|
| Brand name | Wadermoon |
| Product line | PCI-E 1X to External 4 PCI-E USB 3.0 |
| Product type | PCI Express to USB Card |
| Ports & slots | |
| External USB ports | 4 Port |
| Size & build | |
| Product dimensions | 4.72 × 2.64 × 2.24 in |
| Product weight | 50g |
| Compatibility | |
| Compatible with | Compatible system: DOS / Linux / WinXP / Win7 / Win8 / Win10. |
| In the box | |
| In the box | 1 PCI-E USB 3.0 adapter riser card. |
The adapter measures 4.72 x 2.64 x 2.24 inch and weighs 50g, so check that your chassis has room for a card this size before ordering.
No extra power cable is required; the board draws power from the PCIe x1 slot, but the four USB 3.0 ports carry PCIe signals only — do not plug ordinary USB devices into them.
The aluminum IC heat radiator handles cooling; if temperatures rise over time, clean the heatsink fins and verify the riser remains firmly seated in the slot.
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