Best Startech Serial Port Cards in 2026

Modern computing has moved almost entirely to USB, yet the industrial world still breathes through legacy serial ports. This StarTech expansion card bridges that massive gap by bringing two high-speed DB9 ports to your PCIe slot via a reliable ASIX controller. What actually makes this an IT pro's secret weapon is the configurable power delivery. You can independently set each port to 12v, 5v, or no power through pin 9, which is a lifesaver when interfacing with sensitive medical or scientific equipment. It handles speeds up to 460.8Kbps with a solid 256 byte FIFO buffer, ensuring your PLCs or scanners don't drop data. Whether you are mounting it in a massive server or a slim workstation, the included low-profile brackets make the installation seamless.

Legacy industrial hardware enthusiasts will find this Syba expansion card to be an absolute lifesaver for modernizing older workstations. By utilizing the MCS9922 chipset and a standard 16C550 UART, this card bridges the gap between modern PCI-Express slots and essential serial peripherals. I found the implementation of the 256-byte depth FIFO in transmit to be a crucial detail for maintaining stable data rates up to 250Kbps. It handles both hardware and software flow control with ease, supporting various 5 to 8-bit serial formats without any hiccups. The low-profile form factor is a thoughtful touch, ensuring it fits into compact or small-form-factor builds where space is at a premium. It is a reliable, no-nonsense solution for anyone needing a single, stable DB9 connection.

Most users struggle with unreliable USB-to-serial dongles that drop connections, but this StarTech.com PCIe card provides the rock-solid stability required for mission-critical hardware. Built around the ASIX MCS9922CV-AA controller, it delivers impressive bi-directional speeds up to 460.8Kbps, making it far more dependable than consumer-grade alternatives. I found the configurable power options particularly clever. Being able to select 12v, 5v, or no power via pin 9 allows it to interface with a massive range of legacy equipment without guesswork. Whether you are managing PLCs in a factory, connecting scientific sensors, or maintaining medical equipment, this card handles the heavy lifting. It even includes both low and full-profile brackets, so it fits seamlessly into everything from compact workstations to massive enterprise servers.

The ELIATER dual-port expansion card is a reliable lifeline for anyone needing to bridge the gap between modern desktop PCs and legacy industrial hardware. By utilizing the WCH382 chip and dual 16C550 UARTs, this card delivers impressive data transfer rates of up to 230400Bps, ensuring your RS232 COM port communications remain snappy and stable. I found the installation process straightforward, especially with the included driver files, and the plug-and-play functionality handles IRQ and IO address selection automatically to prevent configuration headaches. It fits seamlessly into a 1-lane PCI-Express slot and even includes a low bracket for versatile chassis compatibility. Whether you are running Windows 11 or a Linux environment, this card provides the essential connectivity required for serious technical workflows.

You might assume a simple serial expansion card is just another piece of legacy hardware destined to fail, but the LinksTek PCIE-SE2 proves that reliable connectivity still matters. I found that integrating this into a desktop or industrial machine is surprisingly straightforward, thanks to the ASIX AX99100 chipset which provides a solid 256-byte transmit FIFO depth. Whether you are trying to hook up an old POS system, a scanner, or specialized industrial testing equipment, this card handles the handshake without a hitch. It fits into almost any available slot—X1, X4, X8, or X16—and the inclusion of both full-size and low-profile brackets means it won't matter if you're working with a massive tower or a slim-profile workstation. Just keep in mind that while Windows users will need to run the included drivers, Linux users will need to be comfortable compiling from the provided source code.

Most professionals struggle with a lack of connectivity when modern motherboards phase out legacy ports, but the DTech 2 Port PCI Serial Card solves this by instantly reclaiming your PCI expansion slots. Instead of hunting for cumbersome converters, you can install this card to gain two reliable RS-232 DB9 ports for your desktop. It utilizes a standard 16C550 UART signal and a WCH chip to maintain a steady data transfer rate of up to 115.2 Kbps. Whether you are connecting a POS machine, a barcode reader, or a GPS unit, the full-height bracket ensures it fits into almost any standard computer chassis. It is a straightforward, no-nonsense solution for keeping essential hardware like fax modems and industrial equipment running on modern Windows systems.

After weeks of use in a high-density industrial testing environment, this StarTech serial expansion card has proven to be a powerhouse for managing complex hardware arrays. Unlike standard adapters that struggle with high-speed data, the 16C1050 UART architecture handles bi-directional speeds up to 921.6Kbps across all eight DB9 ports without breaking a sweat. I was particularly impressed by the configurable power delivery on pin 9, which allows for 12v/5v output to power peripheral devices directly from the card. The inclusion of a DB62 to 8x DB9 breakout cable and hex nuts makes the initial installation in a desktop or server feel much more professional. It is a rugged, reliable solution for anyone connecting PLCs, medical equipment, or scientific sensors to a single workstation.

Most technicians struggle with a lack of legacy connectivity on modern hardware, but the X-MEDIA dual DB9 serial card bridges that gap instantly. Instead of hunting for finicky external converters, this PCIe x1 card provides two reliable RS232 ports driven by a stable WCH382L chipset. I found the compatibility impressive, as it supports everything from legacy DOS and Windows 98SE to modern Windows 10 and Linux environments. With a 256-byte FIFO buffer and data rates hitting 115Kbps per port, it handles standard 5-to-8-bit serial formats without breaking a sweat. It even includes both standard and low-profile brackets, making it a versatile choice whether you are working in a massive workstation or a slim-form factor PC.

StarTech delivers a vital lifeline for anyone trying to bridge the gap between modern hardware and legacy industrial equipment. This PCIe expansion card is a specialized powerhouse, providing both a DB25 parallel port and a DB9 RS232 serial port through a single x1 slot. I found it particularly impressive how it handles diverse workloads, from driving old-school dot matrix printers to interfacing with complex PLCs and scientific sensors in factory automation settings. Thanks to the Asix AX99100 chip and 16C950 UART, you get reliable speeds up to 921.6Kbps for serial tasks and 2.5Mbps for parallel connections. It is a professional-grade solution that simplifies hardware integration without the headache of hunting for separate, incompatible controllers.

The FebSmart USB 3.0 expansion card solves the common headache of power-hungry peripherals by using clever self-powered technology. Instead of forcing you to hunt for an extra SATA power cable from your PSU, this card pulls 12V from your motherboard and converts it to provide a robust 5V/4A total output across its two ports. It is an ideal solution for high-draw devices like NVMe enclosures, industrial cameras, or external hard drives that often struggle with standard motherboard ports. Built around the reliable ASMedia ASM1042 controller, it delivers consistent 5Gbps speeds and includes dedicated safety fuses and capacitors to protect your data. Whether you are upgrading a workstation or a NAS, the inclusion of both full-height and low-profile brackets ensures it fits almost any desktop setup.

You are mid-way through a high-stakes live broadcast or a heavy data transfer from an NVMe enclosure when your desktop suddenly runs out of available high-speed ports. This expansion card solves that bottleneck by adding four USB 3.0 ports via a single PCIe X1 slot. What sets this apart is the built-in self-powered technology, which pulls power directly from the motherboard to provide up to 10W per port without requiring extra cables from your power supply. It uses a Renesas host controller to ensure compatibility across Intel, AMD, and ARM platforms. While the ports share a 5Gbps total bandwidth, the integrated safety fuses and voltage stabilizers make it a reliable choice for power-hungry industrial cameras or external SSDs. Just remember that this is designed for standard 3U desktop cases and won't fit in slim, low-profile builds.

Your massive library of high-capacity mechanical drives is currently hitting a wall because your motherboard has run out of SATA ports. This BEYIMEI expansion card solves that storage bottleneck instantly by providing six additional 6Gbps ports through a single PCIe X4 slot. I found the setup remarkably painless because it is a true plug-and-play experience requiring zero drivers, which is a huge relief when you are mid-build. It utilizes the reliable ASMedia ASM1166 controller to handle everything from high-speed SSDs to bulky 3.5-inch hard drives. The inclusion of six SATA cables and both standard and low-profile brackets in the box means you can deploy this in a desktop tower or a slim workstation without hunting for extra accessories. It even features an intelligent sleep mode to help manage drive activity during downtime.

Most desktop users eventually run out of ports and settle for cheap, underpowered hubs that fail when a heavy drive is plugged in, but the FebSmart expansion card solves this by drawing power directly from your motherboard. This PCIe X1 card utilizes a Renesas host controller to deliver four high-speed USB 3.0 ports that can actually handle power-hungry gear like VR systems, industrial cameras, or NVMe enclosures. What really sets it apart is the built-in self-powered technology. You don't need to mess with extra cables from your power supply to get up to 10W per port. It even includes electronic safety fuses and voltage stabilizers to protect your data and hardware. Whether you are running a modern Windows 11 workstation or a Linux-based NAS, this is a reliable way to expand your connectivity without the typical power drops.

Your workstation is suddenly choked for storage space just as you're mid-build on a massive data project. This MZHOU expansion card solves that bottleneck by instantly adding four independent SATA ports to your existing setup via a single PCIe 3.0 slot. I found the ASM1064 chipset to be incredibly reliable, maintaining steady data transfer rates of up to 6 Gbps across all connections. It feels robustly built, which is vital when you're integrating it into professional environments like industrial test systems or logistics management. The support for hot swapping is a massive convenience for live environments, and the compatibility across Windows 10/11 and Ubuntu makes it a versatile tool for both desktop enthusiasts and server administrators looking to expand their drive capacity without a headache.

The SIIG Legacy and Beyond expansion card is a vital bridge for modern workstations needing to communicate with aging industrial hardware. By utilizing a single PCI Express slot, this card provides two serial ports and one parallel port, making it an essential tool for managing POS systems, security equipment, or specialized scanners. I found the inclusion of the 16C550 UART and a 256-byte FIFO buffer particularly impressive, as these features ensure smooth data transfers even in demanding multitasking environments. The parallel port is fully compliant with the IEEE 1284 standard, supporting ECP, EPP, and SPP modes for maximum compatibility with older printers. For anyone running logistics or testing equipment that predates modern USB standards, this card offers a reliable, professional-grade connectivity solution.

A massive bundle of sixteen SATA cables arrives in the box, instantly signaling that this expansion card is built for serious storage density. Instead of hunting for individual connections, you can immediately populate a high-capacity NAS or workstation with a huge array of drives. The combination of an ASM1064 chip paired with three JMB575 controllers ensures that your data transfers hit those 6Gbps SATA III speeds with impressive stability. It slides easily into almost any PCIe slot, whether you have an X1 or a full X16 opening available. Whether you are running Windows, Linux, or macOS, this card turns a standard PC into a massive data repository without the headache of missing peripherals.

The IO CREST 24-Port SATA III Expansion Card is a massive storage multiplier that turns a single PCIe 3.0 x4 slot into a high-capacity data hub, making it an essential tool for anyone running massive NAS setups or media servers. Using the Micron JMB582 chipset, this card handles up to 24 ports via port multiplier support, offering impressive sequencing speeds of up to 850 MB/s. I found the plug-and-play nature particularly useful. It works across Windows, Mac, and Linux without needing to hunt for drivers. It also supports advanced features like hot-swapping and staggered spin-up, which are critical for protecting your hardware during heavy workloads. Whether you are expanding a workstation or a dedicated storage array, this card provides the robust connectivity required for modern high-density drives.

The ELIATER PCIe Combo Expansion Card provides a seamless bridge between modern desktop PCs and legacy hardware through its dual serial and parallel port design. Testing this card reveals a highly efficient way to breathe life into older printers or industrial equipment without needing an entirely new system. It utilizes the WCH382 chip to deliver IEEE 1284 compliance, reaching data rates up to 1.5Mbps for parallel tasks. Installation is straightforward thanks to its plug-and-play capability, which automatically handles IRQ and IO addresses to prevent common configuration headaches. While you will need to use the included driver file to get everything running smoothly, the wide compatibility spanning from Windows XP all the way to Windows 11 and Linux makes it a versatile tool for any workstation upgrade.

Data-heavy professionals and workstation enthusiasts require the HighPoint Technologies Rocket 1120 to bypass the frustrating limitations of standard PCIe lane distribution. This adapter is a powerhouse because it utilizes an intelligent PCIe switch controller chipset, meaning you don't have to worry about motherboard bifurcation settings to get your drives running. I found the integration incredibly smooth thanks to the native in-box NVMe driver support, which takes the headache out of initial setup. It handles four M.2/U.2 drives simultaneously while maintaining a remarkably quiet profile through its specialized low-noise cooling solutions. Whether you are building a massive storage array or a high-speed scratch disk, this PCIe 3.0 compliant card delivers the massive throughput needed for modern intensive workloads without the thermal or configuration drama.

Modern desktop computers have almost entirely abandoned the legacy ports that industrial machinery and older printers rely on, making hardware like this GODSHARK expansion card an absolute necessity rather than an optional luxury. It utilizes the WCH CH351Q chip to bridge the gap between your PCI slot and a standard DB25 interface. While it is a straightforward solution for reviving older peripherals, there is a specific learning curve involved. You must manually align your printer's port settings with the specific port assigned to the card in your Device Manager to ensure successful communication. Just keep in mind that this is a specialized tool for legacy hardware. It is designed for printers and specific equipment, not for modern encrypted devices, and it is strictly limited to older operating systems like Windows XP, 7, or 8.

Industrial professionals and legacy hardware enthusiasts require this specific expansion card to bridge the gap between modern PCIe slots and essential older peripherals. This SIIG card is a lifesaver for anyone managing POS systems, security hardware, or industrial testing equipment that relies on RS-232 or IEEE 1284 standards. I found the versatility particularly impressive because it doesn't just provide data connectivity. It offers configurable 5V or 12V power output via jumpers, which is a massive advantage for powering handheld scanners or displays directly. With its 16C550 UART and integrated 256-byte FIFO buffers, the data transfer remains stable at up to 250Kbps. Plus, the dual-profile design ensures it fits seamlessly into either a standard tower or a slim low-profile chassis.

After weeks of use in a specialized industrial workstation, this Syba expansion card has proven to be an essential bridge for legacy hardware. The ASIX AX99100 chipset provides a level of reliability that is often missing in budget interface cards, handling everything from standard RS232 to more complex RS485 and RS422 protocols without a hitch. I was particularly impressed by the bi-directional speed range, which scales from a crawl of 50bps up to a brisk 16Mbps per port. Whether you are interfacing with old-school Centronics printers or configuring custom baud rates via internal PLL programming, the versatility is undeniable. It fits snugly into a PCIe x1 slot and includes a low bracket, making it a practical solution for keeping older, mission-critical equipment operational on modern systems.

Modern motherboards have almost entirely phased out the legacy ports required to keep industrial machinery and older printers running. This Syba expansion card solves that connectivity gap by adding two DB9 RS-232 serial ports and a DB25 LPT1 parallel port via a PCI-E 1.0 x1 interface. During testing, the WCH382 chipset proved incredibly versatile, supporting everything from standard 5-bit formats to high-speed 16Mbps bi-directional data rates. It handles hardware and software flow control with ease, making it a reliable bridge for specialized hardware. Whether you are managing MODEM signals like CTS and DTR or utilizing the IEEE1284 multi-mode controller for faster 1.5Mbps parallel data rates, this card provides the essential legacy interface support that modern builds lack.