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StarTech PCI Express Serial Card, 16 DB9 RS232 Ports, TAA (PEX16S550LP) | PCIe Serial Card, Multiport Serial Adapter, Low + Full Profile
StarTech.com

StarTech.com StarTech PCI Express Serial Card

Bottom line: The StarTech.com StarTech PCI Express Serial Card is a specs-and-price decision rather than a crowd-consensus one in the expansion cards category, priced around $389.99 on Amazon as of 2026-10-06. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

$389.99

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Buy on Amazon — $389.99 Compare to similar expansion cards

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Compliant with PCI Express 1.0a/1.1 and compatible with 1x/2x/4x/ 8x/16x PCIe bus
  • ✓ Backed by StarTech.com's warranty and support channels

Cons

  • ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
  • ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

Manufacturer description

This PCI Express serial card adds 16 high-speed RS232 ports to your standard or low-profile desktop or server PC. This lets you maximize the number of available DB9 RS232 ports that are available for connecting your serial-based devices and equipment, while using only a single PCI Express (PCIe) slot. It's the perfect solution for adding the serial ports you need, even if your desktop PC or server only has a limited number of PCIe expansion slots. Add 16 RS232 ports through one PCIe slot You can install the serial card to add 16 high-performance DB9 RS232 serial ports from a single PCIe…

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SpecPicks Verdict

SpecPicks scored StarTech.com StarTech PCI Express Serial Card using a rating × review-volume × price-fit model applied to published specs and reviews across the expansion cards category. StarTech.com's expansion cards lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for expansion cards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • Add 16 RS232 serial ports (DB9) to your low or full-profile computer through a PCI Express slot
  • This 16-Port PCI Express Serial Card provides high-speed PCIe serial card with 16 DB9 RS232 ports from a single PCIe slot
  • Multiport serial adapter card enables high-speed serial communication with data transfer rate up to 921.6 Kbps
  • Compliant with PCI Express 1.0a/1.1 and compatible with 1x/2x/4x/ 8x/16x PCIe bus
  • PCIe serial card / Multiport serial adapter card / Serial PCIe card / Serial expansion card / 16 port serial card / pci serial port / pcie serial card / PCI serial card / pci e serial card / pci express serial card

Full Specifications

BrandStarTech.com
Style16 Port
Style Name16 Port
Unit Count1 Count
Model NumberPEX16S550LP
Built-In Mediabreakout cables (2), driver CD (1), low-profile bracket (1), quick-start guide (1), serial card (1)
Item Type NamePCI Express Serial Card - 16 Port Low-Profile Serial Card - High-Speed PCIe Serial Adapter - Serial Controller DB9 RS232
Mfr Part NumberPEX16S550LP
Compatible DevicesPersonal Computer
Hardware InterfacePCI
Warranty Description2-Year
Item Dimensions L x W x H6.6"L x 2.7"W x 0.9"H
Global Trade Identification Number00065030868228
Full listing titleStarTech PCI Express Serial Card, 16 DB9 RS232 Ports, TAA (PEX16S550LP) | PCIe Serial Card, Multiport Serial Adapter, Low + Full Profile

Ready to buy?

StarTech PCI Express Serial Card, 16 DB9 RS232 Ports, TAA (PEX16S550LP) | PCIe Serial Card, Multiport Serial Adapter, Low + Full Profile is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $389.99

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

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StarTech PCI Express Serial Card, 16 DB9 RS232 Ports, TAA (PEX16S550LP) | PCIe Serial Card, Multiport Serial Adapter, Low + Full Profile
$389.99
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