Can the internal headers be connected to a front panel USB connector (Goal is to enable my external front mounted USB C port)?

I would say yes. I've seen 3.5 inch drive bay adapters that let you add USB 3.1 C ports to a standard PC case and those adapters use the same 19/20 internal cable to connect to your motherboard or add-in card. I think the only caveat would be how fast your speeds would be if you were using both the front and rear type C ports at the same time or using the standard USB 3 ports at the same time as your USB C port in the front.

Does the UASP work on ASUS X99 Deluxe/U3.1 motherboards, with Win 8.1? MS disasabled a bunch of motherboard functions with their January 2018 security update, including the MoBo UASP function. Could I use this to get UASP back? It has ASMedia drivers, so it should be compatible with ASUS motherboards. Anyone have any experience with this?

I do not see any why it should not work. Check your slotfs and make sure it is in the correct slot and you should be ok. As far as drivers you should be ok.

Can you charge a device thru any of the external ports? If so, at what volts and amps?

Yes, but the device you are charging must be the same USB Type as the port you plug it in too. If the device is not type as the port you could damage its I/O puts or even the computer it is in.

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StarTech.com PEXUSB312EIC USB 3.1 PCIE Card - 5 Port - 1x USB-C - 2x USB-A - 1x 2 Port IDC - Internal USB Header Expansion - USB C PCIe Card

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Add an external USB Type-C and two external USB Type-A ports to your computer plus an IDC header port that can provide two internal USB 3.0 ports
5 Port USB 3.1 PCIe Card
1x USBC 2x USB-A + 1x 2 Port IDC (5Gbps)
Works with older USB 3.0 and 2.0 devices
Full and low-profile brackets
Perfect for PC upgrades or builds / Ideal for USB-A and USB-C devices / PCIe USB Host Controller / USB-C card / USB C PCIe card / USB 3.1 controller / Internal USB header expansion

Overview

Specs

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Add an external USB-C and two external USB-A ports to your computer plus an IDC

Model
Brand	StarTech.com
Model	PEXUSB312EIC

Details
Type	PCI Express to USB Card
External USB Ports	3x USB Ports
External Ports	2 x USB Type-A (9 pin) USB 3.0 Female 1 x USB Type-C (24 pin) USB 3.1 (10Gbps) Female
Internal Ports	2 x IDC (20 pin; USB 3.0; Motherboard Header) Receptacle 1 x SATA Power (15 pin) Plug
Standard	USB 3.1
Data Transfer Rate	USB 3.1 Gen 2 - 10 Gbit/s USB 3.0 - 5 Gbit/s
Operating Systems Supported	Windows 10 (32/64), 8 / 8.1 (32/64), 7 (32/64) Windows Server 2012, 2008 R2 Mac OS 10.10, 10.9, 10.8 Linux 3.5
Specifications	Add a USB C (USB 3.1 Gen 2 10Gbps) port to your computer plus two USB Type-A ports and two motherboard headers (5Gbps) 5 Port USB 3.1 (10Gbps) Combo Card 1x USB-C 2x USB-A + 2x IDC (5Gbps) PCIe USB Host Controller / USB Type-C Host Card /PCI Express USB 3.1 Card / USB Type-C Port Adapter Easily add a range of USB port types to your computer / Works with older USB 3.0 and 2.0 devices Full and low-profile brackets / Perfect for PC upgrades or builds / Ideal for USB-A and USB-C devices

Features
Features	Connect a USB-C device, plus a range of other USB devices, to your computer, regardless of their speed or connector type Offers a high-performance USB-C port (10Gbps), two USB-A ports (5Gbps), and two internal USB 3.0 motherboard headers (5Gbps) Works with your existing USB 3.0 and USB 2.0 devices, for cost-effective backward compatibility Compatible with high-powered USB devices, with an integrated SATA power connector Fits into full or low-profile systems, with its dual-profile design USB-C port is Thunderbolt 3 data port compatible (10Gbps data only) PCIe x4 interface compliant with PCI Express Base Specification Revision 3.0 Compliant with UASP (USB Attached SCSI Protocol) Revision 1.0, as well as USB 3.1 Revision 1.0 Fast, hassle-free setup

Dimensions & Weight
Dimensions	4.70" x .070" x 3.10"
Weight	3.50 oz.

Packaging
Package Contents	1 x 5-port USB 3.1 combo card 1 x low-profile bracket 1 x quick-start guide

Additional Information
First Listed on Newegg	September 01, 2016

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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Return Policies

Return for refund within: 30 days

Return for replacement within: 30 days

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StarTech.com PEXUSB312EIC USB 3.1 PCIE Card - 5 Port - 1x USB-C - 2x USB-A - 1x 2 Port IDC - Internal USB Header Expansion - USB C PCIe Card

Learn more about the STARTECH PEXUSB312EIC

Customer Reviews of the STARTECH PEXUSB312EIC

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16815158428

StarTech.com PEXUSB312EIC USB 3.1 PCIE Card - 5 Port - 1x USB-C - 2x USB-A - 1x 2 Port IDC - Internal USB Header Expansion - USB C PCIe Card

Learn more about the STARTECH PEXUSB312EIC

Customer Reviews of the STARTECH PEXUSB312EIC

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info