Product comparison · 2 interface cards/adapters

StarTech.com U.2 to PCIe Adapter for vs StarTech.com Discontinued and replaced by PEXUSB311AC3 - Dual Port USB 3.1 Card - 1x USB-C - 1x USB-A - 10Gbps per port - Expansion Card - USB 3.1 PCI-E Card -

24specifications compared
18differ
6identical
13known for one product only

Key differences

Output interface
- U.2 to PCIe Adapter for:U.2
- Discontinued and replaced by PEXUSB311AC3 - Dual Port USB 3.1 Card - 1x USB-C - 1x USB-A - 10Gbps per port - Expansion Card - USB 3.1 PCI-E Card -:USB 3.2 Gen 1 (3.1 Gen 1)
Expansion card standard
- U.2 to PCIe Adapter for:PCIe 4.0
- Discontinued and replaced by PEXUSB311AC3 - Dual Port USB 3.1 Card - 1x USB-C - 1x USB-A - 10Gbps per port - Expansion Card - USB 3.1 PCI-E Card -:PCIe 3.0
Product colour
- U.2 to PCIe Adapter for:Red
- Discontinued and replaced by PEXUSB311AC3 - Dual Port USB 3.1 Card - 1x USB-C - 1x USB-A - 10Gbps per port - Expansion Card - USB 3.1 PCI-E Card -:Black
Certification
- U.2 to PCIe Adapter for:CE, FCC
- Discontinued and replaced by PEXUSB311AC3 - Dual Port USB 3.1 Card - 1x USB-C - 1x USB-A - 10Gbps per port - Expansion Card - USB 3.1 PCI-E Card -:CE, FCC, REACH
Storage temperature (T-T)
- U.2 to PCIe Adapter for:-25 - 70 °C
- Discontinued and replaced by PEXUSB311AC3 - Dual Port USB 3.1 Card - 1x USB-C - 1x USB-A - 10Gbps per port - Expansion Card - USB 3.1 PCI-E Card -:-20 - 60 °C
Operating relative humidity (H-H)
- U.2 to PCIe Adapter for:15 - 90%
- Discontinued and replaced by PEXUSB311AC3 - Dual Port USB 3.1 Card - 1x USB-C - 1x USB-A - 10Gbps per port - Expansion Card - USB 3.1 PCI-E Card -:20 - 80%
Width
- U.2 to PCIe Adapter for:122 mm
- Discontinued and replaced by PEXUSB311AC3 - Dual Port USB 3.1 Card - 1x USB-C - 1x USB-A - 10Gbps per port - Expansion Card - USB 3.1 PCI-E Card -:108 mm
Depth
- U.2 to PCIe Adapter for:165 mm
- Discontinued and replaced by PEXUSB311AC3 - Dual Port USB 3.1 Card - 1x USB-C - 1x USB-A - 10Gbps per port - Expansion Card - USB 3.1 PCI-E Card -:122 mm

Side by side

Differences highlightedShow differences only

Comparison of PEX4SFF8639, PEXUSB311AC2
37 specifications	A StarTech.com U.2 to PCIe Adapter for Model PEX4SFF8639 View product	B StarTech.com Discontinued and replaced by PEXUSB311AC3 - Dual Port USB 3.1 Card - 1x USB-C - 1x USB-A - 10Gbps per port - Expansion Card - USB 3.1 PCI-E Card - Model PEXUSB311AC2 View product
Ports & interfaces2 differ
Host interface	PCIe	PCIe
Output interfaceDiffers	U.2	USB 3.2 Gen 1 (3.1 Gen 1)
Expansion card standardDiffers	PCIe 4.0	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	Red	Black
CertificationDiffers	CE, FCC	CE, FCC, REACH
LED indicatorsKnown for one	Activity	Unknown — not stated by the source
Hot-swapKnown for one	No	Unknown — not stated by the source
Featuresidentical
ChipsetKnown for one	Unknown — not stated by the source	ASMedia - ASM2142
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
Plug and PlayKnown for one	Yes	Unknown — not stated by the source
Operational conditions2 differ
Operating temperature (T-T)	5 - 50 °C	5 - 50 °C
Storage temperature (T-T)Differs	-25 - 70 °C	-20 - 60 °C
Operating relative humidity (H-H)Differs	15 - 90%	20 - 80%
System requirementsidentical
Windows operating systems supportedKnown for one	Unknown — not stated by the source	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 Pro, Windows 10 Pro x64, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 H
Linux operating systems supportedKnown for one	Unknown — not stated by the source	Yes
Server operating systems supportedKnown for one	Unknown — not stated by the source	Windows Server 2008 R2, Windows Server 2012, Windows Server 2016, Windows Server 2019
Technical detailsidentical
Compliance certificates	RoHS	RoHS
Weight & dimensions4 differ
WidthDiffers	122 mm	108 mm
DepthDiffers	165 mm	122 mm
HeightDiffers	22 mm	21 mm
WeightDiffers	65 g	50 g
Packaging data4 differ
Mounting brackets includedKnown for one	Unknown — not stated by the source	Yes
Quick installation guide	Yes	Yes
Package widthDiffers	218 mm	142 mm
Package depthDiffers	158 mm	170 mm
Package heightDiffers	48 mm	30 mm
Package weightDiffers	161 g	120 g
Screws includedKnown for one	Yes	Unknown — not stated by the source
Logistics data4 differ
Harmonized System (HS) code	84733020	84733020
Products per master (outer) caseDiffers	40 pc(s)	80 pc(s)
Master (outer) case widthDiffers	470 mm	355 mm
Master (outer) case lengthDiffers	349 mm	590 mm
Master (outer) case heightDiffers	500 mm	310 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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