StarTech.com
StarTech.com PEX4S553 Internal Serial Adapter Card
Enhance your system's connectivity with the StarTech.com PEX4S553 4-Port Native PCI Express RS232 Serial Adapter Card. This card adds four RS-232 serial ports to your computer through a single PCIe slot, fitting both standard and small form factor cases. Its native single-chip design ensures true PCIe performance, outperforming bridge-chip solutions. Installation is flexible with included standard and low-profile brackets. This adapter is designed to reduce CPU load for optimized system performance and is backed by a lifetime warranty.
$102.99
Owner Satisfaction
4.4
/ 5
Category Rank
451
/ 1154
#451 in Computer Interface Cards & Adapters
Price vs Category Average
-82%
Below average
Number of Ports
4
Who it's for
- High Port Density
- Reliable High-Speed UART
- Broad System Compatibility
Who should skip it
- Legacy Technology Focus
- Requires Internal PCIe Slot
- Higher Cost per Port
Key Specs
Number of Ports
4
Interface Type
PCI Express
Supported Protocol
RS232
Host Interface Type
PCI Express
Manufacturer Part Number
PEX4S553
Product Category
Interface Cards/Adapters
Bracket Profile Type
Full Height, Low Profile
Card Form Factor
PCIe Full-Height, PCIe Low-Profile
Features
- Adds four RS-232 serial ports
- True PCIe performance with native design
- Includes standard and low-profile brackets
- Reduces CPU load for efficiency
- Versatile installation compatibility
- Backed by a lifetime warranty
What customers say
Customers overwhelmingly value this internal serial adapter card for its exceptional reliability and stability, making it essential for integrating legacy RS-232 devices into modern systems. Its key strength is the high-density four port capacity, efficiently using a single PCIe slot to streamline system architecture. Installation is generally straightforward, with quick recognition across contemporary operating systems using native drivers. While rare driver sourcing issues exist for older builds, the consensus confirms superior stability and long term dependability. Users see this card as critical infrastructure that reliably bridges new hardware with essential legacy peripherals, justifying its value through consistent, error free communication in demanding applications.
Still have a question?
Ask Hayley anything about this product before you decide.