Does it come with an internal power cable?

I’m pretty sure mine didn’t, but I didn’t need one anyway.

Do you need to plugin the power via molex or sata connector at the rear or will the card work without said power?

I've run mine from the molex power connector. I'd also add to David Neal's answer neither my HP z800s or z400s will run this card. Did work in the older HP xw8600.

How many usb endpoints does this controller add?

The PEXUSB3S44V has 4 USB 3.0 ports with each port having its own Renesas µPD720202 USB 3.0 controller. This controller supports xHCI and provides 96 endpoints. So in total, the card provides 384 endpoints, 96 per port. Matt, StarTech.com Support

Can it handle 3 usb 2.0 webcams without any issues or loss of data?

Since each port has it's own controller it should be able to. It handles Oculus Rift without any issues.

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StarTech.com 4 Port USB 3.0 PCIe Card w/ 4 Dedicated 5Gbps Channels (USB 3.1 Gen 1) - UASP - SATA / LP4 Power - PCI Express Adapter Card (PEXUSB3S44V)

StarTech.com 4 Port USB 3.0 PCIe Card w/ 4 Dedicated 5Gbps Channels (USB 3.1 Gen 1) - UASP - SATA / LP4 Power - PCI Express Adapter Card (PEXUSB3S44V)

Product ID: 48114130

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Details

Brand
StarTech
Hardware Interface
USB 3.0
Product Dimensions
6.6"L x 0.6"W
Style
PCI Express
Item Weight
0.09 Kilograms

⚡5 Gbps speed

🔌4 dedicated ports

🛡️2-year warranty

Description

🚀 Elevate Your Connectivity Game!

POWER UP YOUR DEVICES - Easily power high-demand USB devices with LP4 or SATA connectors.
PEACE OF MIND WARRANTY - Benefit from a 2-year warranty and lifetime technical support.
UASP SUPPORT FOR SPEED - Enjoy up to 70% faster speeds with UASP-enabled devices.
VERSATILE CONNECTIVITY - Connect multiple devices like hard drives, VR headsets, and more.
UNLEASH YOUR USB POTENTIAL - Experience lightning-fast data transfer with 5 Gbps per channel.

The StarTech.com 4 Port USB 3.0 PCIe Card is a high-performance expansion card designed to enhance your USB 3.0 device efficiency. With four dedicated channels offering up to 5 Gbps bandwidth each, this card supports high-powered devices and ensures versatile connectivity for various peripherals. It features UASP support for faster data transfer rates and comes with a 2-year warranty and lifetime technical support.

Specifications

Brand	StarTech
Series	4 Port PCIe USB Card
Item model number	PEXUSB3S44V
Operating System	Windows 8 Linux Windows 7 Windows Server 2012 Windows 10 Windows Server 2016 Windows Server 2019
Item Weight	3.24 ounces
Product Dimensions	6.6 x 0.6 x 4.7 inches
Item Dimensions LxWxH	6.6 x 0.6 x 4.7 inches
Department	Default Category
Manufacturer	StarTech.com
ASIN	B00HJZEA2S
Is Discontinued By Manufacturer	No
Date First Available	December 27, 2013

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