Will I see speed increase with thunderbolt/Ether adapter?

I have a 2012 Mac Pro connected to my network with Ethernet cable: MP > router > cable modem. Cable and modem are 10/100/1000.
Apple makes a Thunderbolt / Gigabit Ethernet adapter (http://store.apple.com/us/product/MD463ZM/A/thunderbolt-to-gigabit-ethernet-adap ter).
Anyone know if I might see any noticeable speed increase to the Internet switching from my Ethernet port out, to Thunderbolt port out using this adapter?
My broadband is 30 Mbps down, 5 Mbps Up, btw.
Thx!

Most devices that are serving as the Ethernet Switches are only 100BaseT capable. That is why I said "choose" to go up to that speed. (Some folks, like me, have to go out and buy Gigabit-capable switches.) Apple Routers (they don't make Just a Switch, but you can configure a Base Station as a Switch) are Gigabit-capable.
My modem, router Ethernet ports are both Gigabit capable and I'm using the best wire I could get Cat 6.
The longest cable is 50 feet.
If all 8 conductors are crimped into the connectors with all 8 wires in use, you are all set. Cables that use only two pairs of wires instead of four pairs will not work.
Check by using Network Utility.app to see if you are already using Gigabit Ethernet speeds. If you ARE, then you should also configure Jumbo frames. If not, you can manually configure it to Gigabit speeds, Full duplex with flow Control, but if it cannot, for same reason, connect at that speed it will not fall back, it will fail to connect.

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