Product comparison · 2 interface cards/adapters

StarTech.com 4-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 Card - 16950 UART - Expansion Card - Win vs StarTech.com 2-Port 10Gbps USB-A & USB-C PCIe Card - USB 3.2 Gen 2 PCI Express Type C/A Host Controller Card Adapter - USB 3.2 Gen 2 PCIe Expansion Add-On Card

29specifications compared
22differ
7identical
18known for one product only

Key differences

Output interface
- 4-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 Card - 16950 UART - Expansion Card - Win:Serial
- 2-Port 10Gbps USB-A & USB-C PCIe Card - USB 3.2 Gen 2 PCI Express Type C/A Host Controller Card Adapter - USB 3.2 Gen 2 PCIe Expansion Add-On Card:USB 3.2 Gen 2 (3.1 Gen 2)
Product colour
- 4-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 Card - 16950 UART - Expansion Card - Win:Green
- 2-Port 10Gbps USB-A & USB-C PCIe Card - USB 3.2 Gen 2 PCI Express Type C/A Host Controller Card Adapter - USB 3.2 Gen 2 PCIe Expansion Add-On Card:Red
Mean time between failures (MTBF)
- 4-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 Card - 16950 UART - Expansion Card - Win:214358 h
- 2-Port 10Gbps USB-A & USB-C PCIe Card - USB 3.2 Gen 2 PCI Express Type C/A Host Controller Card Adapter - USB 3.2 Gen 2 PCIe Expansion Add-On Card:2684396 h
Chipset
- 4-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 Card - 16950 UART - Expansion Card - Win:Asix AX99100
- 2-Port 10Gbps USB-A & USB-C PCIe Card - USB 3.2 Gen 2 PCI Express Type C/A Host Controller Card Adapter - USB 3.2 Gen 2 PCIe Expansion Add-On Card:ASMedia - ASM3142
Operating temperature (T-T)
- 4-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 Card - 16950 UART - Expansion Card - Win:-10 - 80 °C
- 2-Port 10Gbps USB-A & USB-C PCIe Card - USB 3.2 Gen 2 PCI Express Type C/A Host Controller Card Adapter - USB 3.2 Gen 2 PCIe Expansion Add-On Card:5 - 50 °C
Storage temperature (T-T)
- 4-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 Card - 16950 UART - Expansion Card - Win:-20 - 100 °C
- 2-Port 10Gbps USB-A & USB-C PCIe Card - USB 3.2 Gen 2 PCI Express Type C/A Host Controller Card Adapter - USB 3.2 Gen 2 PCIe Expansion Add-On Card:-20 - 85 °C
Operating relative humidity (H-H)
- 4-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 Card - 16950 UART - Expansion Card - Win:5 - 85%
- 2-Port 10Gbps USB-A & USB-C PCIe Card - USB 3.2 Gen 2 PCI Express Type C/A Host Controller Card Adapter - USB 3.2 Gen 2 PCIe Expansion Add-On Card:20 - 80%
Compliance certificates
- 4-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 Card - 16950 UART - Expansion Card - Win:RoHS
- 2-Port 10Gbps USB-A & USB-C PCIe Card - USB 3.2 Gen 2 PCI Express Type C/A Host Controller Card Adapter - USB 3.2 Gen 2 PCIe Expansion Add-On Card:CE, RoHS

Side by side

Differences highlightedShow differences only

Comparison of PEX4S953, PEXUSB311AC3
47 specifications	A StarTech.com 4-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 Card - 16950 UART - Expansion Card - Win Model PEX4S953 View product	B StarTech.com 2-Port 10Gbps USB-A & USB-C PCIe Card - USB 3.2 Gen 2 PCI Express Type C/A Host Controller Card Adapter - USB 3.2 Gen 2 PCIe Expansion Add-On Card Model PEXUSB311AC3 View product
Ports & interfaces1 differ
Host interface	PCIe	PCIe
Output interfaceDiffers	Serial	USB 3.2 Gen 2 (3.1 Gen 2)
Expansion card form factor	Full-height / Low-profile	Full-height / Low-profile
Serial ports quantityKnown for one	4	Unknown — not stated by the source
Serial interface typeKnown for one	RS-232	Unknown — not stated by the source
Expansion card standardKnown for one	Unknown — not stated by the source	PCIe 3.0
USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantityKnown for one	Unknown — not stated by the source	1
USB 3.2 Gen 2 (3.1 Gen 2) Type-C ports quantityKnown for one	Unknown — not stated by the source	1
Design2 differ
Internal	Yes	Yes
Product colourDiffers	Green	Red
Mean time between failures (MTBF)Differs	214358 h	2684396 h
CertificationKnown for one	CE, FCC, Microsoft WHQL	Unknown — not stated by the source
Features1 differ
ChipsetDiffers	Asix AX99100	ASMedia - ASM3142
Baud rateKnown for one	921.6 Kbit/s	Unknown — not stated by the source
FIFO (First In, First Out)Known for one	256 B	Unknown — not stated by the source
Data bitsKnown for one	5, 6, 7, 8, 9	Unknown — not stated by the source
Stop bitsKnown for one	1, 1.5, 2	Unknown — not stated by the source
Parity bitKnown for one	Even, Mark, No, Odd, Space	Unknown — not stated by the source
Flow Control typeKnown for one	No, RTS/CTS, XON/XOFF	Unknown — not stated by the source
Data transfer rate (max)Known for one	Unknown — not stated by the source	10 Gbit/s
UASP supportKnown for one	Unknown — not stated by the source	Yes
Operational conditions3 differ
Operating temperature (T-T)Differs	-10 - 80 °C	5 - 50 °C
Storage temperature (T-T)Differs	-20 - 100 °C	-20 - 85 °C
Operating relative humidity (H-H)Differs	5 - 85%	20 - 80%
System requirements2 differ
Windows operating systems supportedDiffers	Windows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 IoT Enterprise, Windows 10 Pro, Windows 10 Pro x64, Windows 10 x64, Windows 7, Windows 7 Enterprise, Windows 7 Enterpris	Windows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 IoT Enterprise, Windows 10 Pro, Windows 10 Pro x64, Windows 10 x64, Windows 11, Windows 11 x64, Windows 7, Windows 7 Ent
Linux operating systems supported	Yes	Yes
Server operating systems supportedDiffers	Windows Server 2003, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016	Windows Server 2008 R2, Windows Server 2012, Windows Server 2016, Windows Server 2019
Mac operating systems supportedKnown for one	Unknown — not stated by the source	Mac OS X 10.13 High Sierra, Mac OS X 10.14 Mojave, Mac OS X 10.15 Catalina, Mac OS X 11.0 Big Sur, Mac OS X 12.0 Monterey, Mac OS X 13.0 Ventura
Technical details1 differ
Compliance certificatesDiffers	RoHS	CE, RoHS
Sustainability complianceKnown for one	Unknown — not stated by the source	Yes
Weight & dimensions4 differ
WidthDiffers	63 mm	81 mm
DepthDiffers	75 mm	120 mm
HeightDiffers	15 mm	19 mm
WeightDiffers	50 g	48 g
Packaging data4 differ
QuantityKnown for one	1	Unknown — not stated by the source
Cables includedKnown for one	Serial	Unknown — not stated by the source
Mounting brackets included	Yes	Yes
Quick installation guide	Yes	Yes
Package widthDiffers	152 mm	143 mm
Package depthDiffers	216 mm	174 mm
Package heightDiffers	54 mm	33 mm
Package weightDiffers	371 g	123 g
Logistics data4 differ
Harmonized System (HS) code	84733020	84733020
Products per master (outer) caseDiffers	16 pc(s)	60 pc(s)
Master (outer) case widthDiffers	344 mm	381 mm
Master (outer) case lengthDiffers	474 mm	377 mm
Master (outer) case heightDiffers	246 mm	517 mm

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.

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