Product comparison · 2 interface cards/adapters

StarTech.com 1 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART vs StarTech.com 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART

Key differences

Serial ports quantity
- 1 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART:1
- 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART:2
Width
- 1 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART:105 mm
- 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART:120 mm
Depth
- 1 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART:120 mm
- 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART:105 mm
Weight
- 1 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART:51.5 g
- 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART:140 g
Package weight
- 1 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART:170 g
- 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART:250 g
I/O ports
- 1 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART:1 - DB9 M
- 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART:1 - DB25 M 2 - DB9 M

Differences highlightedShow differences only

Comparison of PEX1S552, PEX2S5521P
20 specifications	A StarTech.com 1 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART Model PEX1S552 View product	B StarTech.com 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART Model PEX2S5521P View product
Ports & interfaces1 differ
Output interfaceKnown for one	Unknown — not stated by the source	PCI Express
Serial ports quantityDiffers	1	2
Parallel ports quantityKnown for one	Unknown — not stated by the source	1
Designidentical
CertificationKnown for one	Unknown — not stated by the source	CE, FCC, RoSH
Weight & dimensions3 differ
WidthDiffers	105 mm	120 mm
DepthDiffers	120 mm	105 mm
WeightDiffers	51.5 g	140 g
Packaging data1 differ
Package weightDiffers	170 g	250 g
Other features2 differ
Compatible operating systemsDiffers	Windows 2000/XP/2003/Vista/Linux Kernel 2.6.11 & +/MAC 10.4 & +	DOS, Windows 95/ 98SE/ 2000/ XP(32/64bit)/ Server 2003(32/64bit)/ Vista(32/64bit)/ 7(32/64bit)/ Server 2008 R2, Linux, & Mac OS 10.4.x & Windows XP Embedded/ POS Ready 2009/ Embedded System 2009 OS/ CE 5.0/ CE 6.0
Mac compatibilityKnown for one	Unknown — not stated by the source	Yes
Supported data transfer ratesKnown for one	Unknown — not stated by the source	460.8 Kbps, 1.5 Mbps
I/O portsDiffers	1 - DB9 M	1 - DB25 M 2 - DB9 M
Data transfer rateKnown for one	0.4608 Mbit/s	Unknown — not stated by the source

A dash means the value is not stated by the source. Unknown values are never counted for or against a product, and there is no overall score.