# StarTech PEX1TO162 Review: PCIe x1 to x16 Adapter Bandwidth, Power & Fit > PEX1TO162 fits x16-size cards in an x1 slot. Covers x1 bandwidth per PCIe gen, slot power limits, card height and who should skip it. Tags: interface-card, startech, pex1to162, pcie-adapter, pcie-riser, pcie-x1, low-profile Source: https://www.amazon.co.jp/dp/B0039XPS5W Article page: https://web-autoai.com/articles/startechcom-pci-express-x1x16-pcie-x1x16-pex1to162?lang=en Prices and ratings change over time — check the article page for the current values. --- This article covers the StarTech. com PEX1TO162 — PCIe x1 to x16 Low-Profile Slot Expansion Adapter: how it works, how much bandwidth an x1 link actually gives you, and the pitfalls buyers tend to discover after installation. ## Overview The StarTech. com PEX1TO162 is a passive (pass-through) adapter. It plugs into a PCIe x1 slot on the motherboard and provides one x16-size slot on top. If your only free slot is an x1 and you need to physically install an x4 to x16 card, it is an inexpensive fix. The electrical link stays x1, though, so both bandwidth and slot power are limited to what an x1 slot provides. It is not a way to run a gaming graphics card at full performance. On Amazon. co. That suggests steady demand for a small part that solves slot-shape problems cheaply. ## How It Works: Why Cards Don't Fit On many motherboards, the x1 slots are closed at the back end, so the long edge connector of an x16 card cannot physically go in. This adapter plugs into the x1 slot and holds the card in its own x16 slot above. Because it has no active components, it needs no drivers or configuration. PCIe negotiates the link width at startup, so x4, x8 and x16 cards generally work over an x1 link. A small number of cards are not designed for x1 operation, however. Before relying on an important card, check its datasheet or the manufacturer's guidance. ## Is x1 Enough? Bandwidth by PCIe Generation Whether this adapter makes sense comes down to whether x1 bandwidth is enough. | PCIe generation | x1 bandwidth (approx.) | Comfortable at x1 | |---|---|---| | 1.0 | ~250 MB/s | Gigabit LAN, USB 2.0, audio | | 2.0 | ~500 MB/s | One SATA SSD, one USB 3.0 port | | 3.0 | ~985 MB/s | 2.5GbE, one or two SATA SSDs | | 4.0 | ~1.97 GB/s | Up to about 10GbE | The link runs at the lowest generation among the host slot, the adapter and the card. If your motherboard's x1 slot is Gen3, the ceiling is about 1 GB/s. In that case, an NVMe SSD on an M.2 adapter card, which would exceed 3 GB/s at Gen3 x4, is capped at roughly 1 GB/s. On the same slot, a 10GbE NIC (about 1.25 GB/s needed) cannot reach full speed, and all the ports of a 16-port SAS/SATA HBA share a single lane. A card being detected and a card running at its intended speed are two different things. ## Compatibility Guide - **PCIe generation**: The listing data says PCIe 1.0 through 5.0 are supported. As a passive part, it will physically fit in any of them. However, the longer signal path leaves less margin at higher speeds. If a card is unstable on a Gen4 or Gen5 board, the usual fix is to force the slot to Gen3 or Gen2 in the BIOS. - **Card height**: The adapter raises the card above its normal position. The card's bracket screw hole may no longer line up with the case's expansion slot. In slim cases, the extra height can make the card hit the cover. - **Clearance**: An x16 card's connector is long. Check that the part extending toward the back of the board does not hit the next slot, M.2 heatsinks, SATA connectors or the CPU cooler. - **Slot power**: By specification, an x16 slot can supply up to about 75 W, while an x1 slot is typically limited to around 10 to 25 W. For cards without auxiliary power connectors, check that the card's draw fits within that range. - **Form factor**: Listed as compatible with both low-profile and full-profile setups, with a low-profile bracket included. ## Product Info | Item | Details | |---|---| | Electrical interface | PCI Express x1 | | Physical interface | PCI Express x16 | | Design | Pass-through (passive) | | Form factors | Low profile / Full profile | | Listed dimensions | 219 x 46 x 158 mm | | Listed weight | 0.01 kg | The listed dimensions of 219 x 46 x 158 mm are large for the adapter alone and may be the package size. If exact size matters, check the product photos or the manufacturer's documentation. The listed port count of 2 most likely counts the x1 edge connector and the x16 slot; it does not mean the adapter has external ports. Check the retailer's page for the latest price. co. Prices change with sales and stock, so check the current price on each listing before buying. The original article mentioned a 2-year StarTech. com warranty; confirm the warranty terms with the seller. ## Best Use Cases - **ATX / Micro-ATX systems where only an x1 slot is free**: Useful for running an x4 or x8 NIC, a SATA/SAS controller or a capture card, if you accept the reduced bandwidth. - **Adding a low-power card for extra displays**: Can work for multi-monitor use, as long as the card's power draw stays within what an x1 slot supplies. - **Test benches and reusing old cards**: Far cheaper than replacing the motherboard when you only need to try an existing card temporarily. ## Before You Buy **Not for gaming GPUs. ** Bandwidth drops to x1 and slot power stays at x1 levels. The card will not reach its intended performance and may not run reliably. If GPU performance matters, use a system with a real x16 slot. **Pointless for NVMe or 10GbE speed. ** As the table shows, Gen3 x1 tops out around 1 GB/s. An M.2 adapter card on this riser will not give you a fast boot drive. **Measure slim cases first. ** The original article recommended this adapter for slim PCs, but it raises the card. In a chassis with no spare height, it can make things worse, and the bracket may not line up with the case slot. **You may not need it at all. ** If your x1 slot is open-ended, an x16 card can sometimes be installed directly, provided nothing blocks it. If you just want more SATA or USB ports, a native x1 card avoids the height and clearance problems entirely. **About the listing data. ** As noted above, the listed dimensions and port count do not seem to describe the adapter itself. When you open the product page, confirm from the photos and the model number PEX1TO162 that it is the right item. ## FAQ **Q. Will a graphics card work? ** A. It may be detected and output a display, but with x1 bandwidth and around 10 to 25 W of slot power it is not suitable for gaming. **Q. Does it need drivers or setup? ** A. No. It is passive, so only the installed card's own driver is needed. **Q. Is it faster in an x16 slot? ** A. No. The adapter's motherboard connector is x1, so the link is always x1. **Q. ** A. The listing says yes. If you see instability, lowering the slot generation in the BIOS is the usual fix. **Q. Can I use it in a low-profile PC? ** A. A low-profile bracket is listed as included, but the card sits higher, so whether it fits depends on the case's internal height. ### Product Disclosure (Amazon) - Manufacturer: StarTech.com(スターテック) - Seller: Startech Japan KK - Fulfilled by: Amazon - ASIN: B0039XPS5W - Note: This article covers a manufacturer-made product based on Amazon listing details.