Do you need to plug in the external power source to make this adapter work? I'm installing it in a server that doesn't seem to have either LP4 or SATA power internally.

if the device you're connecting self powered and or does not require charging then yes, you may be able to use it, however, if the devices are not self powered or have a battery such as a cell phone that requires charging then you'll probably need to supply additional power because the USB 3.0 Ports may be able to supply up to 5 amps each.

The card specifically states it has 4 usb 3.0 controllers. What about usb 2.0? Can I run four usb 2.0 devices at full 480 mbps bandwidth?

I can tell you from experience that this card is capable of running 4 Logitech c920 web cams streaming 1080p video at 30fps in color. I don't know off hand how much data that would consume but I do know the cameras are usb 2.0 I hope this was enough to answer your question.

Will this work on my motherboard - 0NW73C?

Can't say for sure, but likely. It works on my Tyan Thunder S8230 (PCIe 2.0) mobo, but only with powered devices like external docking stations for SSD/HDDs. For USB sticks, sometimes it would work and sometimes not, depending on the slot order I used in the adapter and other dependencies. Yes, I did have the adapter hooked internally to power. Your mobo is more up-to-date in the PCIe world than mine, so one hopes the adapter works better for you. It is very performant for the devices that I do having working with it.

What type of power does this card require?

The card requires power through either an LP4 (4-pin Molex) or SATA power connector.

Is this PCIe USB 3.0 Card compatible with my HP Pro 3500?

Yes, this PCIe USB 3.0 Card is compatible with the HP Pro 3500.

Is this card capable of charging my Apple device?

Yes, this card supports USB Battery Charging Specification 1.2, which includes Apple Mode device charging.

How many USB ports does this card add to my system?

This card adds four USB 3.0 ports to your system.

Can I use this card with older USB devices?

Yes, the card is backward compatible with USB 2.0 and USB 1.0/1.1 devices.

Can you use two of these cards in a PC, or would the cards conflict with each other?

Yes, two cards can be used without any conflict.

If this is using a PCIe 2.0 x4 connector how does it manage 20Mbps? Wouldn't the theoretical max be 16Gbps?

I think they mean, that each usb 3 port is independent of each other(not a hub). 4 x 5Gbits usb3ports . They just didn't account for the pcie x4 bottle neck. So it would max out at 16Gbs if all ports were maxed out.

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StarTech.com PEXUSB3S44V 4 Port PCI Express (PCIe) SuperSpeed USB 3.0 Card Adapter w/ 4 Dedicated 5Gbps Channels - UASP - SATA / LP4 Power

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External USB Ports: 4 Ext Quad Bus

4 Ext
4 Ext Dual Bus
4 Ext Quad Bus

Add four USB 3.0 ports with four independent channels LP/SATA power & charging support to your PC through a PCI Express slot
Compatible with HP Pro 3500 / Lenovo ThinkCentre M93p
4 Port PCIe USB 3.0 Card w/ 4 Dedicated 5Gbps Channels / USB 3.0 UASP Card
PCIe USB 3.0 Controller
4 Independent Port USB 3.0 Expansion Card w/ UASP / SATA Powered USB 3.0 Adapter Card w/ up to 20 Gbps total bandwidth
USB 3.0 PCIe Card w/ USB Battery Charging Specification 1.2 (Apple Mode device charging only)

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StarTech PEXUSB3S44V. Brand NewIncludes 2 Year Warranty.. Product # PEXUSB3S44V.. Add four USB 3.0 ports with four independent channels, LP/SATA power, and charging support to your PC through a PCI Express slot. The PEXUSB3S44V 4-Port PCI Express USB 3.0 Card lets you add four, dedicated 5 Gbps USB 3.0 ports to your PCIe x4-enabled PC. This independent port architecture improves USB 3.0 performance by transferring data on four individual channels to your computer, giving you faster file transfers... When multiple devices are connected, traditional single bus USB 3.0 cards share your maximum bandwidth between all ports.

By employing four host controller chipsets, each port operates on a separate independent transmission channel. Dedicating up to 5 Gbps to each USB port reduces performance bottlenecks, and effectively quadruples your total available to bandwidth to 20 Gbps... Enhanced with UASP support (USB Attached SCSI Protocol), this USB 3.0 controller performs up to 70% faster than conventional USB 3.0 when paired with a
UASP supported enclosure (Note: UASP requires a compatible operating system). Using a more efficient protocol than the traditional USB BOT (Bulk-Only Transport), UASP technology optimizes transfers by allowing multiple commands to be processed simultaneously, significantly increasing transfer speeds for less wait time on data transfers. See our UASP test results below for further details... For high-power USB devices, this PCIe USB 3.0 card includes an optional SATA or LP4 power connector to connect to your system

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Model
Brand	StarTech.com
Model	PEXUSB3S44V

Details
Type	PCI Express
Specifications	Industry Standards: - USB 3.0 Specification Rev. 1.0 - USB Battery Charging Specification Rev. 1.2 (Apple Mode only) - PCI Express Base Specification Rev. 2.0 - Intel xHCI Specification Rev. 1.0 Interface: USB 3.0 Connector Type(s): 1 - PCI Express x4 Male External Ports: 4 - USB 3.0 A (9 pin; SuperSpeed) Female Internal Ports: - 1 - LP4 (4 pin; Molex Large Drive Power) Female - 1 - SATA Power (15 pin) Plug

Features
Features	Add 4 SuperSpeed USB 3.0 ports with Quad Bus architecture (5Gbps per port) to your PCI Express-enabled PC Provides four external, quad bus USB 3.0 Ports Supports up to 20 Gbps total transfer bandwidth - Up to 5 Gbps per port UASP support across all four ports PCIe x4 interface compliant with PCI Express 2.0 specifications Optional LP4 or SATA power connector provides up to 900mA per USB port Supports USB Battery Charging Specification 1.2 (Apple Mode only) Fully compliant with USB 3.0 rev 1.0 and Intel xHCI rev 1.0 specifications Backward compatible with USB 2.0 and USB 1.0/1.1 devices Includes a Low Profile/half-height installation bracket Hot-swap feature to connect/disconnect devices without powering down the system Add four USB 3.0 ports with four independent channels LP/SATA power & charging support to your PC through a PCI Express slot Compatible with HP Pro 3500 / Lenovo ThinkCentre M93p 4 Port PCIe USB 3.0 Card w/ 4 Dedicated 5Gbps Channels / USB 3.0 UASP Card PCIe USB 3.0 Controller 4 Independent Port USB 3.0 Expansion Card w/ UASP / SATA Powered USB 3.0 Adapter Card w/ up to 20 Gbps total bandwidth USB 3.0 PCIe Card w/ USB Battery Charging Specification 1.2 (Apple Mode device charging only)

Dimensions & Weight
Dimensions	0.59" x 2.17" x 6.57" (W x H x L)
Weight	0.13lb

Additional Information
First Listed on Newegg	March 06, 2014

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Limited Warranty period (labor): 1 year
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The StarTech.com PEXUSB3S44V is a PCIe x4 expansion card that adds four USB 3.0 ports with independent 5 Gbps channels, making it suitable for desktop PC users who need more high-speed USB connectivity and up to 20 Gbps of combined bandwidth.

Recommended For

Desktop users who transfer files between multiple USB 3.0 storage devices and want each port on a separate host-controller channel rather than sharing one card-level USB bus.
PC VR users troubleshooting USB connection or bandwidth issues with headsets such as the Oculus Rift S; community reports describe using this card to add a dedicated USB controller for the headset.
Desktop owners who need four additional USB-A ports for peripherals or external drives and have an available PCIe x4 slot, including small-form-factor PCs that can use the included low-profile bracket.
Users connecting several bus-powered USB devices who can connect SATA or LP4 power from the PC’s power supply to support the card’s per-port power provision.

Spec Summary

Attribute	Value
Best For	Adding four USB 3.0 ports to a PCIe-enabled PC, with independent 5Gbps channels, UASP support, and optional device charging
Interface And Ports	PCI Express x4 card with four USB 3.0 Type-A SuperSpeed female ports; backward compatible with USB 2.0 and USB 1.0/1.1 devices
Bandwidth And Data Features	Quad-bus architecture provides up to 5Gbps per port and 20Gbps total bandwidth, with UASP support on all four ports
Power And Charging	Optional LP4 or SATA power input provides up to 900mA per USB port; supports USB Battery Charging Specification 1.2 in Apple Mode only
Standards And Compatibility	Complies with PCI Express 2.0, USB 3.0 revision 1.0, and Intel xHCI 1.0 specifications; listed as compatible with HP Pro 3500 and Lenovo ThinkCentre M93p
Installation And Use	Includes a low-profile/half-height bracket and supports hot-swapping devices without powering down the system
Dimensions And Weight	0.59 × 2.17 × 6.57 in (W × H × L); 0.13 lb
Model Identifiers	StarTech.com PEXUSB3S44V

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StarTech.com PEXUSB3S44V 4 Port PCI Express (PCIe) SuperSpeed USB 3.0 Card Adapter w/ 4 Dedicated 5Gbps Channels - UASP - SATA / LP4 Power

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Spec Summary

Item#: N82E16812400546

Best Sellers

StarTech.com PEXUSB3S44V 4 Port PCI Express (PCIe) SuperSpeed USB 3.0 Card Adapter w/ 4 Dedicated 5Gbps Channels - UASP - SATA / LP4 Power

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Customer Reviews of the STARTECH PEXUSB3S44V

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Spec Summary