Will this work okay in a PCIe 16x slot?

Yes. Generally speaking if a PCIe card physically fits in the slot it will work. This even applies the other direction (i.e. x4 card in x1 slot) when motherboards have open back slots although obviously maximum throughput will be limited. There is one caveat to keep in mind. If you're running a mainstream platform (i.e. AM4 or LGA1151) due to the limited lane count, the second x16 slot is often shared with the main slot through what is known as bifurcation. If this is the case then inserting a card into that slot will force the GPU into x8. Refer to the specs/manual for your motherboard to determine which slots share lanes.

does it work well in centos 7?

Do not use centos 7? However, works great in about 8 computers.

does have WOL (wake on lan)?

I spoke to asus support and they said it does if your mobo supports it.

I see driver support for Win 7 - 10, but was curious if the matching Server OS (2008 R2 - 2016) would install and function as well? From experience, the drivers would probably work, but I've seen instances of installers having very rigid version checks, which then requires some hackery to get things to work...

I was able to install the drivers that came with the card on Windows Server 2016 with no issues

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ASUS XG-C100C 10G Network Adapter PCI-E x4 Card with Single RJ-45 Port

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Hyper-fast 10 Gbps Networking delivers up to 10X-faster data-transfer speeds
Full Compatibility with current network standards, including 10 / 5 / 2.5 / 1 Gbps and 100 Mbps
Windows and Linux Support for flexible OS integration with Windows 10 / 8.1 / 8 / 7 and Linux Kernel 4.4 / 4.2 / 3.6 / 3.2
RJ45 Port easily upgrades your desktop to 10 Gbps networking
Prioritize Your Data with built-in Quality-of-Service (QoS) technology, allowing you to prioritize bandwidth and supported data packets

Overview

Specs

Reviews (26)

The ASUS XG-C100C uses fully backwards compatible, next-generation 10GBase-T (10G) networking technology to deliver speeds of up to 10Gbps 10X faster than standard gigabit Ethernet. It enables ultra-fast 10Gbps network access for desktop PCs, so you can easily handle the most data-intensive tasks in your office or at home.

Model
Brand	ASUS
Model	XG-C100C

Details
Standards	IEEE 802.3an 10GBASE-T IEEE 802.3u 100Base-TX Fast Ethernet IEEE 802.3ab 1000BASE-T Gigabit Ethernet IEEE 802.3az Energy Efficient Ethernet IEEE 802.1p Priority Queuing
Interface	PCI-Express
LEDs	Dual color Speed LED Single color Link / Act LED
Temperature	Operating Temperature: 0 ~ 40 degree Celsius (32 ~ 104 degree Fahrenheit) Storage Temperature: -40 ~ 85 degree Celsius (-40 ~ 185 degree Fahrenheit)

Features
Features	Port Attributes: RJ-45 for 1 x 100 Mbps / 1 Gbps / 2.5 Gbps / 5 Gbps / 10 Gbps Mbps Ethernet Ports Auto-Negotiation: Speed Performance: Jumbo Frame: up to 9KB Hyper-fast 10 Gbps Networking - Enjoy up to 10X-faster data-transfer speeds for bandwidth-demanding tasks. Complete Compatibility - XG-C100C is compatible with current network standards, including 10 / 5 / 2.5 / 1 Gbps and 100 Mbps, for seamless backward compatibility. Windows and Linux Support - flexible OS integration with Windows 10 / 8.1 / 8 / 7 and Linux Kernel 4.4 / 4.2 / 3.6 / 3.2. RJ45 Port for Easy Migration - Easily upgrade to 10 Gbps networking using standard copper network cables. Prioritize Your Games - Built-in Quality-of-Service (QoS) technology lets you prioritize bandwidth and supported gaming packets for a smooth gaming experience.

Dimensions & Weight
Dimensions	0.81" x 3.33" x 4.72"
Weight	0.20 lb.

Additional Information
First Listed on Newegg	June 27, 2017

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Item#: N82E16833320272

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ASUS XG-C100C 10G Network Adapter PCI-E x4 Card with Single RJ-45 Port

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Customer Reviews of the ASUS XG-C100C

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Warranty, Returns, And Additional Information

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Manufacturer Contact Info