Product comparison · 2 interface cards/adapters

StarTech.com 2 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

Weight
- 2 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART:63.5 g
- 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART:140 g
Package weight
- 2 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART:190 g
- 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART:250 g
Supported data transfer rates
- 2 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART:460.8Kbps
- 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART:460.8 Kbps, 1.5 Mbps
I/O ports
- 2 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART:2 - 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 PEX2S552, PEX2S5521P
19 specifications	A StarTech.com 2 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART Model PEX2S552 View product	B StarTech.com 2S1P Native PCI Express Parallel Serial Combo Card with 16550 UART Model PEX2S5521P View product
Ports & interfacesidentical
Host interface	PCIe	PCIe
Output interface	PCI Express	PCI Express
Serial ports quantity	2	2
Parallel ports quantityKnown for one	Unknown — not stated by the source	1
Designidentical
Certification	CE, FCC, RoSH	CE, FCC, RoSH
Featuresidentical
Chipset	MosChip MCS9901	MosChip MCS9901
Weight & dimensions1 differ
Width	120 mm	120 mm
Depth	105 mm	105 mm
Height	20 mm	20 mm
WeightDiffers	63.5 g	140 g
Packaging data1 differ
Package width	40 mm	40 mm
Package depth	210 mm	210 mm
Package height	145 mm	145 mm
Package weightDiffers	190 g	250 g
Other features2 differ
Connectivity technology	Wired	Wired
Compatible operating systems	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	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 compatibility	Yes	Yes
Supported data transfer ratesDiffers	460.8Kbps	460.8 Kbps, 1.5 Mbps
I/O portsDiffers	2 - DB9 M	1 - DB25 M 2 - DB9 M

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.