Try to connect your system to another gigabit network and observe if the download speed can go higher than 100mbps.
If it goes higher than 100-130 mbps, it means that it's a limitation on you fiber internet connection.
If the download speed remains the around the same rate, we may need to look into the issue further.
I'll wait for your test results.
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Thanks for the reply!
I don't have another gigabit network available, but I do have another gigabit system on the same network, and I have tested the cable and port I am using with this system on the other and the fiber speed checks out fine. It is definitely something with the embedded card.
I look forward to more ideas.
Not sure if you have installed our drivers for Intel® 82579 Gigabit Ethernet Controller. In case you are using our driver already, you may want to try out the driver version provided by your motherboard manufacturer.
1. Network Adapter Driver for Windows 8.1* - Intel® Download Center
You may also check your adapter's properties. Look for "Legacy Switch Compatibility Mode" - change the settings (Enable/Disable).
I hope this is helpful.