Specifications
Manufacturer: StarTech.com
Manufacturer Part Number: PEX4S553B
Manufacturer Website Address: http://www.startech.com
Brand Name: StarTech.com
Product Name: 4 Port RS232 PCI Express Serial Card w/ Breakout Cable
Marketing Information:

The PEX4S553B 4-Port PCI Express Serial Card (with breakout cable) lets you add 4 RS232 serial ports using a single PCIe expansion slot, with an included 1-to-4 cable enabling you to add 4 serial ports to a single low profile slot.
The serial card features a native single-chip design that provides optimum reliability and speed, reducing the CPU load by up to 48% over conventional bridge-chip serial cards – a cost-effective solution for connecting legacy serial devices to PCIe-enabled computers.
The multi-port serial adapter includes both full profile and low profile/half-height brackets for compatibility with standard and small form factor computers, and is compatible with a broad range of operating systems, including Windows, Linux, and MAC OS.
This product is a replacement for our PEX4S552B card.
Backed by a StarTech.com lifetime warranty and free lifetime technical support.

More from the Manufacturer

Product Type: Multiport Serial Adapter
Technical Information
Host Interface: PCI Express x1
Maximum Data Transfer Rate: 1.95 Mbit/s
Interfaces/Ports
Ports Expandability: 4 x DB-9 RS-232 – Serial, Via Cable
Physical Characteristics
Form Factor: Plug-in Card
Miscellaneous
Environmentally Friendly: Yes
TAA Compliant: Yes